Breeding Yorkshire Terriers

Complete Guide for Responsible Breeders

Breeding Yorkshire Terriers presents unique challenges that distinguish this breed from other toy dogs. With an average litter size of just 3.3 puppies, exceptionally small birth weights, and breed-specific health concerns including a 98% periodontal disease rate, successful Yorkshire Terrier breeding requires meticulous planning, comprehensive health testing, and specialized reproductive management.

Breed Overview

The Yorkshire Terrier originated in 19th century Yorkshire, England, when Scottish weavers migrated south bringing their working terriers. These dogs were crossed with local breeds including the Skye Terrier, Maltese, and now-extinct Scotch, Clydesdale, and Waterside terriers to create a compact ratter perfectly suited for catching vermin in textile mills and coal mines. The breed's foundation sire, Huddersfield Ben, was registered with the Kennel Club and established the refined type we recognize today.

The American Kennel Club recognized the Yorkshire Terrier in 1885, making it one of the earliest registered toy breeds. What began as a working-class ratter transformed into an elegant companion dog prized for its silky floor-length coat and confident personality.

Currently ranked #11 in AKC registrations, the Yorkshire Terrier remains one of America's most popular toy breeds, though registration numbers show a decreasing trend as breeds like the Havanese and Maltese gain market share. The Yorkshire Terrier Club of America serves as the AKC parent club, providing breed education, breeder referrals, and preservation resources.

Despite its diminutive size, the Yorkshire Terrier retains the bold terrier temperament that made it an effective working dog. This combination of elegance and confidence creates specific breeding considerations around temperament preservation, structural soundness in a toy package, and maintaining the breed's distinctive coat quality.

Breed Standard Summary for Breeders

The Yorkshire Terrier standard emphasizes a long-haired toy terrier with a compact, well-proportioned body. The breed's hallmark is the long, silky coat that parts down the back from nose to tail, flowing straight and evenly on both sides. Despite its small size, the Yorkshire Terrier carries itself with an air of importance and self-confidence that reflects its terrier heritage.

Size specifications:

Both males and females stand 6-9 inches at the shoulder and weigh 4-7 pounds. The standard includes a critical disqualification: any dog exceeding 7 pounds cannot be shown or should be bred. This hard weight limit is non-negotiable and must be a primary selection criterion for breeding stock.

Key structural priorities for breeding decisions:

The Yorkshire Terrier must maintain a level topline with a compact, well-proportioned body. Roached or swayed backs are serious faults that compromise both appearance and structural integrity. The head should feature a small, flat skull with a moderately short muzzle, complemented by high-set V-shaped ears that stand erect. Eyes must be medium-sized, dark, and sparkling with an intelligent expression—light or round eyes detract from proper breed type.

Coat requirements:

Coat quality is paramount in Yorkshire Terrier breeding. The texture must be silky, fine, and perfectly straight—never woolly, cottony, or coarse. Puppies are born black and tan, with the black gradually transitioning to steel blue through a progressive graying gene. This color transition should be complete by maturity, typically 18-24 months. The tan markings should be rich and deep, not extending onto the body.

Serious faults affecting breeding stock:

• Roached or swayed topline (structural unsoundness)
• Incorrect coat texture (cottony, woolly, or coarse coats)
• Incorrect color or pattern (failure to transition to blue, incorrect tan placement)
• Shy or aggressive temperament (contrary to breed character)
• Poor ear set or ears that fail to stand erect
• Oversized dogs approaching or exceeding the 7-pound limit

When selecting breeding stock, prioritize dogs that exemplify correct coat texture and color transition, sound structure despite small size, proper head type with correct ear carriage, and the confident, spirited temperament that defines the breed.

Yorkshire Terrier Reproductive Profile

Yorkshire Terrier reproduction presents distinct challenges related to the breed's diminutive size. The average litter size is 3.3 puppies, with a typical range of 1-5 puppies per litter. Single-puppy litters occur in approximately 10% of breedings, while litters of 5 puppies represent only 15% of births. This small litter size significantly impacts breeding economics and program sustainability.

The C-section rate for Yorkshire Terriers is 15%, which is moderate compared to brachycephalic breeds but higher than many sporting or working breeds. The decision between natural whelping and planned C-section depends on multiple factors including dam size, litter size, and previous whelping history. Dams under 4 pounds face substantially higher complication risks and may require surgical delivery.

Breed-specific fertility challenges:

Natural breeding can be mechanically difficult due to the Yorkshire Terrier's small size, particularly when there is a significant size difference between the stud and dam. Many breeders routinely use artificial insemination with fresh or chilled semen to ensure successful breeding while minimizing stress and injury risk. Fresh AI is commonly used for local studs, while chilled semen enables access to quality studs nationwide.

Hypoglycemia presents a significant concern during both pregnancy and lactation. Small dams may struggle to maintain adequate blood glucose levels, especially when producing milk for a litter. Breeders must monitor pregnant and nursing Yorkshire Terriers closely, providing frequent small meals and supplementing with high-calorie nutritional paste when needed.

The breed's small size also correlates with higher neonatal mortality rates. Puppies weighing under 2.5 ounces at birth have elevated fading puppy syndrome risk. Litter sizes of 1-2 puppies paradoxically increase C-section risk because single large puppies may not position correctly for delivery, and small litters may fail to trigger adequate uterine contractions.

When planning breedings, Yorkshire Terrier breeders must account for these reproductive realities: small litters, potential need for AI, hypoglycemia management, and intensive neonatal monitoring. The combination of small litter sizes and high per-puppy production costs makes Yorkshire Terrier breeding economically challenging compared to breeds with larger average litters.

Breeding Age and Timeline

Female Yorkshire Terriers typically experience their first heat cycle between 6-12 months of age, though this can vary based on individual maturation rates and size. However, first heat does not indicate breeding readiness. The recommended first breeding age for Yorkshire Terrier females is 18-24 months, ideally on the second or third heat cycle. This delay allows full physical maturity, completion of health testing, and evaluation of coat development and structure.

Males can be used for breeding starting at 12-18 months once they have achieved sexual maturity and completed preliminary health evaluations. However, final OFA evaluations for patellar luxation cannot be submitted until 12 months of age, which should guide breeding decisions.

Complete breeding timeline:

12 months: Minimum age for OFA patellar luxation evaluation (required for CHIC). Eye examinations should begin and continue annually. This is also the appropriate age for optional testing including Legg-Calve-Perthes evaluation and bile acids test for liver function.

18-24 months: Recommended first breeding age for females. By this age, the coat color transition from black to blue should be well underway, allowing accurate evaluation of color genetics. Structural evaluation is complete, and the female has achieved full physical maturity.

2-6 years: Prime breeding years for both males and females. Yorkshire Terriers in this age range typically maintain optimal fertility and physical condition.

5-6 years: Recommended retirement age for breeding females. Due to the breed's small size and the physical demands of pregnancy and lactation, early retirement helps preserve the dam's health and quality of life.

Maximum litters: The Yorkshire Terrier Club of America and responsible breeders limit females to 4 litters maximum across their breeding career. Given the recommended retirement age of 5-6 years and minimum 18-month spacing between litters, most females will produce 3-4 litters total.

Annual health testing: Eye examinations (ACVO/CAER) must be repeated annually for CHIC qualification and should continue throughout a dog's breeding career to detect late-onset conditions like cataracts or progressive retinal atrophy.

This conservative breeding timeline prioritizes long-term health over maximum production. Yorkshire Terriers bred too young or too frequently face increased risks of dystocia, hypoglycemia complications, and premature health decline.

Required Health Testing

The Canine Health Information Center (CHIC) requires two specific health evaluations for Yorkshire Terrier breeding stock. While this is among the shortest CHIC requirement lists of any breed, responsible breeders typically perform additional recommended testing to screen for breed-specific conditions.

CHIC Required Testing:

ACVO Eye Examination (CAER) screens for progressive retinal atrophy, cataracts, glaucoma, and other hereditary eye diseases. The examination must be performed by a board-certified veterinary ophthalmologist and costs approximately $150 per exam. This test is required annually, as many eye conditions are late-onset and may not appear until middle age. Yorkshire Terriers can develop progressive retinal atrophy (PRA-prcd), cataracts, and retinal dysplasia.

Patellar Luxation OFA Evaluation assesses kneecap stability and joint structure. This is a one-time evaluation that can be performed at 12 months of age or older, costing approximately $75. Given that 26% of Yorkshire Terriers are affected by patellar luxation, this screening is critical for identifying breeding stock with sound joint structure.

Total CHIC required testing cost: Approximately $225 for the initial year (eye exam + patella evaluation), then $150 annually for repeat eye examinations.

Strongly Recommended Additional Testing:

Legg-Calve-Perthes OFA Evaluation ($50) screens for hip joint degeneration specific to toy breeds. This condition causes progressive lameness in young dogs and has a suspected hereditary component in Yorkshire Terriers.

Thyroid Panel - OFA ($120) detects autoimmune thyroiditis, which can affect reproduction, coat quality, and overall health. While not common in Yorkshire Terriers, thyroid dysfunction can impact breeding success.

Bile Acids Test ($150) evaluates liver function and screens for portosystemic shunts (PSS). This test is particularly important for Yorkshire Terriers because the breed has a 36x higher risk of PSS than other breeds, with approximately 3% prevalence. A pre-breeding bile acids test can identify dogs with compromised liver function before the stress of pregnancy.

DNA Banking ($65) through OFA or a similar service preserves genetic material for future research and testing as new DNA tests become available.

Tests should be performed through OFA-approved facilities to ensure results are permanently recorded and publicly accessible. Yorkshire Terrier breeders should verify that both the sire and dam have current CHIC numbers before proceeding with a breeding. Additionally, reviewing the pedigree for incidence of portosystemic shunt, tracheal collapse, and severe patellar luxation helps inform breeding decisions beyond individual test results.

Hereditary Health Conditions

Yorkshire Terriers face several hereditary health challenges that responsible breeders must understand and screen for. Some conditions have DNA tests available, while others require clinical evaluation and pedigree analysis.

Patellar Luxation affects 26% of Yorkshire Terriers, making it the most prevalent orthopedic condition in the breed. The condition involves displacement of the kneecap from its normal position, causing intermittent lameness, a characteristic "skipping" gait, inability to fully extend the knee, and progressive arthritis. The inheritance mode is polygenic with environmental factors contributing to expression. Age of onset ranges from 4 months to 2 years, though some cases appear later. No DNA test is available; OFA patellar evaluation is the screening method. Breeding dogs should be graded normal (OFA Excellent, Good, or Fair), and avoiding breeding two dogs with even mild luxation reduces offspring risk.

Portosystemic Shunt (PSS) occurs in approximately 3% of Yorkshire Terriers—a 36-fold higher risk than other breeds. This serious condition involves abnormal blood vessel connections that allow blood to bypass the liver, resulting in toxin accumulation. Clinical signs include stunted growth, lethargy, vomiting, disorientation, neurological symptoms (head-pressing, circling), and seizures, particularly after eating protein-rich meals. Most cases appear between 6 months and 2 years. The inheritance mode is polygenic, and no DNA test exists. Pre-breeding bile acids testing screens for liver dysfunction, though it may not detect all shunt cases. Breeders should carefully review pedigrees for PSS history and avoid breeding dogs from lines with multiple affected relatives.

Progressive Retinal Atrophy (PRA-prcd) affects 5-10% of Yorkshire Terriers and is inherited as an autosomal recessive trait. A DNA test is available through OFA/OptiGen, allowing breeders to identify clear, carrier, and affected dogs. Clinical signs include progressive vision loss starting with night blindness, dilated pupils, and increased eye shine. The late-onset form typically appears between 3-5 years of age. Affected dogs eventually become completely blind. Because the inheritance is simple recessive, two carrier dogs have a 25% chance of producing affected puppies. Responsible breeders test all breeding stock and avoid carrier-to-carrier breedings.

Tracheal Collapse disproportionately affects Yorkshire Terriers, which account for 65% of all tracheal collapse cases across all breeds. The condition involves progressive weakening of the tracheal cartilage rings, causing the airway to flatten. Clinical signs include a characteristic "goose honk" cough, difficulty breathing, exercise intolerance, and cyanosis in severe cases. While onset typically occurs in middle age (6-7 years), some dogs show signs earlier. A hereditary component is suspected but the exact inheritance mode remains unknown, and no DNA test exists. Breeders should avoid breeding dogs with early-onset tracheal collapse and favor lines with older dogs showing no respiratory symptoms.

Legg-Calve-Perthes Disease occurs at moderate frequency in Yorkshire Terriers and other toy breeds. This condition involves avascular necrosis of the femoral head, causing progressive hind limb lameness, muscle atrophy, and pain on hip manipulation. Age of onset is typically 4-12 months. The condition is suspected to be autosomal recessive in Yorkshire Terriers, though no DNA test is available. OFA hip evaluation can identify affected dogs before breeding.

Periodontal Disease shows remarkably high prevalence in Yorkshire Terriers, with 98% of dogs showing early signs by 37 weeks of age. The breed's small jaw size and tooth crowding create a predisposition to tartar accumulation, gum inflammation, tooth loss, and secondary systemic infections. While not directly hereditary, the anatomical factors contributing to dental disease are breed-specific. Breeding stock should receive regular dental care and professional cleanings to maintain health and prevent secondary complications. Breeders should educate puppy buyers about the critical importance of dental care from an early age.

Hypoglycemia commonly affects Yorkshire Terrier puppies and small adults under 4 pounds, though it is not directly hereditary but rather related to the breed's size and metabolic characteristics. Clinical signs include weakness, tremors, disorientation, seizures, and collapse. The condition is most dangerous during puppyhood (8-16 weeks) and can persist in very small adults. Breeders must monitor puppy weights closely, ensure frequent feeding, and educate buyers about hypoglycemia recognition and emergency treatment.

The combination of these hereditary conditions makes comprehensive health testing and pedigree research essential for Yorkshire Terrier breeding programs. DNA testing for PRA should be universal, patellar evaluations are mandatory, and bile acids testing provides valuable PSS screening. Beyond individual testing, analyzing pedigrees for patterns of portosystemic shunt, early-onset tracheal collapse, and severe dental disease helps identify lines to avoid or approach cautiously.

Color and Coat Genetics

Yorkshire Terrier color genetics are moderately complex, involving several genetic loci that produce the breed's distinctive appearance. Understanding these genetics helps breeders make informed decisions and predict puppy colors accurately.

AKC Accepted Colors:

The Yorkshire Terrier standard recognizes four color variations, all of which follow the same genetic pattern with minor expression differences:

• Blue and Tan
• Blue and Gold
• Black and Tan
• Black and Gold

All four variations are equally correct under the breed standard. The "blue" designation refers to a steel-blue shade resulting from progressive graying, while "gold" indicates a richer, warmer shade than "tan." Both describe the same basic color pattern.

Genetic Loci Involved:

B Locus (Brown): Yorkshire Terriers are fixed for B/B, producing non-diluted black eumelanin. No brown or chocolate variants exist in the breed.

D Locus (Dilution): The breed is fixed for D/D (non-diluted). There are no genetically dilute (blue in the traditional sense) Yorkshire Terriers—the blue color comes from progressive graying, not dilution.

G Locus (Progressive Graying): This is the defining genetic characteristic of Yorkshire Terrier coat color. Puppies are born with black eumelanin in the saddle area, which progressively grays to steel blue over 18-24 months. This is the same gene that causes graying in other breeds but is fixed and uniform in Yorkshire Terriers.

E Locus (Extension): Controls the extension of eumelanin (black/blue) pigment. Yorkshire Terriers carry genes that restrict eumelanin to specific body areas while allowing phaeomelanin (tan/gold) expression on the head, chest, and legs.

A Locus (Agouti): Yorkshire Terriers are fixed for the tan point pattern (at/at), which creates the characteristic tan markings on the head, chest, legs, and under the tail.

Color Development Timeline:

Yorkshire Terrier puppies are born black and tan. The black areas (saddle, back, upper body) begin transitioning to blue through progressive graying, typically starting around 6 months of age. The transition should be complete by 18-24 months, though some dogs continue gradual lightening into adulthood. The tan markings may intensify and enrich to gold but should remain restricted to the proper body areas without extending onto the back or sides.

Disqualifying Colors:

Any solid color (solid black, solid tan, solid blue) disqualifies a dog from the show ring and indicates incorrect breeding. Similarly, any color pattern other than blue/black with tan/gold markings is incorrect. White markings, particolor patterns, or merle are not recognized and suggest outcross breeding.

Health-Linked Color Considerations:

Unlike some breeds where specific colors correlate with health issues (such as merle-associated deafness or dilution alopecia), Yorkshire Terriers have no documented health concerns linked to their accepted color patterns. The blue coloring results from progressive graying rather than dilution, so dilution alopecia does not occur.

Breeding Predictions:

Because all properly bred Yorkshire Terriers carry the same fixed genetics at the major color loci (B/B, D/D, at/at, plus the graying gene), all breedings produce puppies with the accepted black and tan coloring at birth that will transition to blue and tan/gold. There are no complex color calculations or carrier considerations for Yorkshire Terrier color breeding.

The primary selection consideration for color genetics is evaluating the quality and speed of the blue transition. Dogs that gray too quickly may become excessively light or silvery, while dogs that gray slowly may retain excessive black into adulthood. Both extremes are undesirable. Breeders should select dogs with appropriate moderate graying that produces the rich steel-blue shade by maturity.

Selecting Yorkshire Terrier Breeding Stock

Yorkshire Terrier breeding stock selection requires evaluation of multiple factors, with coat quality and size regulation being paramount concerns. The breed's distinctive appearance and hard maximum weight limit make selection criteria particularly specific.

Conformation Priorities:

Coat texture and color transition rank as the most critical selection factors. The coat must be silky, fine, and perfectly straight—never woolly, cottony, or coarse. Puppies with correct coat texture at 8 weeks will maintain that quality into adulthood, while cottony-coated puppies rarely develop proper adult coat. The progressive graying from black to steel blue should proceed at a moderate rate, achieving the proper steel-blue shade by 18-24 months without becoming excessively light or silvery. Avoid breeding dogs that retain excessive black past 3 years or dogs that gray to pale silver.

Size control is critical due to the 7-pound disqualification. Breeding stock should ideally be 4-6 pounds, providing a safety margin below the maximum. While breeding two 4-pound dogs may produce healthy-sized puppies, this approach risks creating excessively small dogs prone to hypoglycemia and structural fragility. The target is moderate-sized breeding stock (5-6 pounds) that consistently produces puppies within standard. Oversized dogs approaching 7 pounds must not be bred, as they will likely produce oversized offspring.

Structural soundness matters despite the Yorkshire Terrier's toy size. The topline must be level—avoid breeding dogs with roached or swayed backs, as these faults are heritable and compromise structural integrity. Movement should be free and sound with good reach and drive. Patellar evaluations must be normal (OFA Excellent, Good, or Fair), with no evidence of luxation.

Head type and expression distinguish correct breed type. The skull should be small and flat with a moderately short muzzle maintaining proper proportion. Ears must be high-set, V-shaped, and stand erect—dogs with heavy ears that fail to stand erect should not be bred. Eyes should be medium-sized, dark, and sparkling with keen intelligence—avoid light, round, or prominent eyes.

Common Faults to Select Against:

• Oversized dogs approaching or exceeding 7 pounds
• Incorrect coat texture (cottony, woolly, harsh, or wiry)
• Poor or slow color transition (retaining black past 3 years)
• Roached or swayed topline
• Ears that fail to stand erect or are incorrectly set
• Light or round eyes
• Shy or aggressive temperament
• Poor patellar evaluations (OFA Fair or worse)

Temperament Evaluation:

Yorkshire Terriers should exhibit confident, spirited temperaments without shyness or aggression. The breed standard describes an air of importance and self-confidence—this is essential breed character. Evaluate potential breeding stock in multiple environments: at home, in public settings, and with unfamiliar people and dogs. Overly timid dogs that hide or show fear aggression compromise breed type. Equally problematic are hyperaggressive dogs that cannot be handled safely or show unprovoked aggression toward people.

Genetic Diversity - Coefficient of Inbreeding (COI):

The average coefficient of inbreeding for Yorkshire Terriers is 9.6%, which indicates moderate inbreeding across the breed. Responsible breeders target a COI under 6.25% for individual litters, which is lower than the breed average and helps maintain genetic diversity. Using pedigree analysis tools through the Yorkshire Terrier Club of America or third-party databases, calculate the projected COI for planned breedings and favor pairings that introduce some outcross genetics while maintaining breed type.

Stud Selection:

Yorkshire Terrier stud fees range from $500-2,000 depending on the dog's show record, offspring quality, and genetic testing. When selecting a stud, prioritize health testing completion (current CHIC number), complementary structure and type, proven fertility and producing ability, and coefficient of inbreeding calculation for the pairing. Many breeders use AI with chilled semen to access quality studs nationwide, expanding genetic diversity options beyond local dogs.

Pre-breeding evaluation should include reviewing OFA databases for both the proposed sire and dam, analyzing five-generation pedigrees for health patterns (particularly PSS, tracheal collapse, and PRA), calculating COI for the pairing, confirming current health testing, and evaluating coat quality, color transition, and structural soundness in both dogs. The goal is producing puppies that exemplify breed type while advancing genetic health.

Whelping and Neonatal Care

Yorkshire Terrier whelping requires specialized knowledge and intensive monitoring due to the breed's small size and associated complications. Proper preparation and vigilant observation can prevent many common problems.

Whelping Method Considerations:

The decision between natural whelping and planned C-section is breeder-dependent and based on multiple factors. The breed's 15% C-section rate is moderate, meaning most Yorkshire Terriers can whelp naturally with proper monitoring. However, certain risk factors increase C-section likelihood:

• Dams under 4 pounds face substantially higher dystocia risk
• Single-puppy litters or very large individual puppies may not position correctly
• Litters of 1-2 puppies may fail to trigger adequate uterine contractions (uterine inertia)
• Dams with previous C-section history often require repeat surgical delivery
• First-time dams over 4 years old have elevated risk

Breeders should establish a relationship with a veterinarian experienced in toy breed reproduction before breeding. Having emergency surgical capability available 24/7 is essential, as complications can develop rapidly.

Breed-Specific Complications:

Hypoglycemia in the dam is a serious concern during labor and immediately postpartum. The physical stress of whelping combined with fasting during labor can cause blood glucose to drop dangerously. Have Karo syrup or high-calorie nutritional paste available, and monitor the dam for signs of weakness, tremors, or disorientation. Offering small amounts of honey or sugar water during labor breaks can help maintain glucose levels.

Dystocia (difficult birth) occurs more frequently in toy breeds due to narrow pelvic canals and relatively large puppy size. Yorkshire Terriers may struggle with puppies that weigh 15-20% of the dam's pre-pregnancy weight. Signs of dystocia include strong contractions for more than 30 minutes without producing a puppy, weak contractions that fail to progress labor, or more than 2-3 hours between puppies. Emergency veterinary intervention is required when dystocia is suspected.

Uterine inertia (weak or absent contractions) can occur in small litters where hormonal triggers for labor are insufficient. This complication requires oxytocin administration or C-section.

Fading puppy syndrome affects very small neonates, particularly those under 2.5 ounces at birth. These puppies may fail to thrive despite apparently normal delivery and initial nursing. Intensive supplementation and temperature regulation are required.

Birth Weight and Early Growth:

Male Yorkshire Terrier puppies typically weigh 3-4 ounces at birth, while females weigh 2.5-3.5 ounces. These tiny neonates require intensive monitoring and care. The target daily weight gain is 0.5-1 ounce per day during the first two weeks. Puppies should be weighed at least twice daily on a gram scale to detect any weight loss or failure to gain, which indicates inadequate nutrition or illness.

Neonatal Monitoring Protocol:

• Weigh all puppies every 12 hours for the first week, recording weights meticulously
• Observe nursing behavior to ensure each puppy is feeding successfully
• Monitor dam for adequate milk production and willingness to nurse
• Maintain whelping box temperature at 85-90°F for week 1, gradually decreasing to 75°F by week 4
• Supplement any puppy that loses weight or fails to gain with puppy milk replacer
• Watch for hypoglycemia signs in puppies: weakness, tremors, crying, inability to nurse
• Treat hypoglycemia immediately with Karo syrup or sugar water given orally

Supplemental Feeding:

Yorkshire Terrier litters often require supplemental feeding, especially with larger litters (4-5 puppies) or small dams. Puppy milk replacer should be fed every 2-3 hours around the clock for the first two weeks if supplementation is needed. Tube feeding may be necessary for puppies too weak to nurse from a bottle.

Surgical Practices:

Yorkshire Terriers do not require dewclaw removal, tail docking, or ear cropping. The breed standard calls for natural ears and tail, and dewclaws may be left intact. This simplifies neonatal care and eliminates surgical expense.

Comparison to Other Toy Breeds:

Yorkshire Terrier whelping challenges are similar to other toy breeds like Chihuahuas and Pomeranians in terms of small birth weights and hypoglycemia risk. However, Yorkshire Terriers generally have lower C-section rates than brachycephalic toy breeds and can often whelp naturally with proper monitoring.

Successful Yorkshire Terrier whelping requires advance preparation, intensive monitoring, immediate access to veterinary care, and willingness to provide round-the-clock supplemental feeding when needed. The breed's tiny puppy size makes every complication potentially life-threatening, making breeder vigilance essential.

Puppy Development Milestones

Yorkshire Terrier puppies develop through predictable stages, though their small size requires extended care compared to larger breeds. Understanding normal development milestones helps breeders identify potential problems early.

Growth Curve and Weight Targets:

Male Yorkshire Terrier puppies are born weighing approximately 4 ounces (0.25 lbs) and reach 2.2 pounds by 8 weeks. Female puppies start at 3.2 ounces (0.2 lbs) and reach 2.0 pounds by 8 weeks. Growth continues rapidly through 12 weeks, with males reaching approximately 3.4 pounds and females 3.2 pounds.

The growth curve shows consistent gains during the neonatal and early puppy periods, with males maintaining a slight weight advantage throughout development. Puppies typically reach 50-60% of adult weight by 12 weeks and achieve full adult size by 9-12 months.

Weekly Developmental Milestones:

Week 0-2 (Neonatal): Puppies are born with eyes and ears closed, completely dependent on the dam for warmth and nutrition. Target weight gain is 0.5-1 ounce daily. Temperature regulation is critical; maintain whelping box at 85-90°F. Eyes begin opening around day 10-14.

Week 3-4 (Transitional): Eyes and ears fully open. Puppies begin attempting to stand and walk with wobbly gait. First teeth begin erupting around day 21. Puppies start showing interest in semi-solid food but continue nursing primarily. Social interaction with littermates begins.

Week 5-7 (Socialization Period Begins): This marks the beginning of the critical socialization window (3-14 weeks). Puppies become increasingly mobile and curious. Weaning process begins with introduction of puppy mush (soaked kibble) while continuing to nurse. Litter box or pad training can start. Handle puppies daily, introduce gentle noises and varied surfaces.

Week 8-10 (Primary Evaluation Period): Structural evaluation for show potential occurs during this window. Breeders assess body proportions, coat texture (though color is still black and tan), ear set and carriage, head type, and movement. Temperament testing identifies confident, outgoing puppies versus more reserved personalities. First veterinary examination, deworming, and vaccinations occur at 8 weeks.

Week 10-12 (Extended Socialization): Yorkshire Terrier puppies benefit from extended breeder care beyond the standard 8-week placement. By 10-12 weeks, puppies are fully weaned, confidently eating solid food, and better able to regulate blood glucose—reducing hypoglycemia risk in their new homes. Many responsible Yorkshire Terrier breeders prefer 10-12 week placement to ensure puppies are developmentally ready for separation.

Week 12-16 (Coat Development Evaluation): While puppies remain black and tan, coat texture and quality become more apparent. Ears should be fully erect by 16 weeks; late-rising ears may indicate improper ear cartilage. The progressive graying that produces the adult blue coat has not yet begun but coat texture (silky versus cottony) is clearly identifiable.

Socialization Window (3-14 Weeks):

The critical socialization period for Yorkshire Terriers follows the same timing as other breeds but requires careful balance. Puppies need exposure to varied experiences—different surfaces, sounds, people, gentle handling—while avoiding overwhelming their small size and delicate structure. Socialization activities should include:

• Daily handling and gentle restraint practice
• Introduction to household sounds (vacuum, doorbell, television)
• Supervised exposure to different floor surfaces (tile, carpet, grass, concrete)
• Meeting unfamiliar people of different ages (emphasize gentle interaction)
• Positive introduction to grooming tools (brush, nail trimmer, hair dryer)
• Car ride exposure

Weaning and Go-Home Age:

Weaning typically begins at 5-6 weeks with gradual introduction of solid food, with complete weaning achieved by 8-9 weeks. However, go-home age for Yorkshire Terriers is recommended at 10-12 weeks rather than the 8-week minimum. This extended care period allows:

• More stable blood glucose regulation, reducing hypoglycemia risk
• Additional socialization and confident personality development
• Structural evaluation when type is more clearly expressed
• Complete vaccination series (some breeders prefer puppies receive 2 sets of shots before placement)
• Buyer education and transition preparation

Structural Evaluation Timing:

Initial structure evaluation occurs at 8-10 weeks when body proportions, head type, ear set, and movement patterns are identifiable. However, final breeding quality assessment should wait until 12-16 weeks when coat quality is more apparent and ear carriage is confirmed. Show potential cannot be fully determined until coat color transition begins around 6 months.

Fear Periods:

Yorkshire Terriers experience developmental fear periods around 8-10 weeks and again at 6-8 months. During these periods, puppies may show increased caution or fear of previously accepted stimuli. Avoid traumatic experiences during fear periods, and provide positive reinforcement for confident behavior.

Adult Size Achievement:

Yorkshire Terriers reach full adult height by 9-12 months, though some dogs continue filling out and developing coat length until 18-24 months. The progressive graying that produces the adult blue coat is typically complete by 18-24 months, making this the earliest age at which full adult appearance can be assessed.

Proper puppy development management—including extended care periods, careful socialization, and thorough structural evaluation—sets the foundation for healthy, well-adjusted adult Yorkshire Terriers.

Breeding Economics

Yorkshire Terrier breeding presents economic challenges due to small average litter sizes and high per-puppy production costs. Understanding the complete financial picture is essential for sustainable breeding programs.

Complete Cost Breakdown:

Health Testing (per breeding dog): $225 for CHIC required testing (patellar luxation $75 one-time, eye exam $150 annually). Responsible breeders often add optional testing including Legg-Perthes evaluation ($50), thyroid panel ($120), and bile acids test ($150), bringing comprehensive testing to $545 per dog.

Stud Fee: $1,000 average for a quality CHIC-certified stud. Fees range from $500 for young or unproven males to $2,000 for champions with proven offspring. Many breeders use AI with chilled semen, which adds shipping costs ($150-250) but provides access to superior genetics nationwide.

Progesterone Testing: $300 for the series of blood tests required to determine optimal breeding timing. Tests typically run every 2-3 days as the female approaches ovulation, requiring 3-5 tests per cycle.

Prenatal Veterinary Care: $400 for confirmation ultrasound (around day 28-30), radiographs near term to count puppies (day 55+), and prenatal wellness examinations. This cost may be higher if complications develop during pregnancy.

Whelping Costs - Natural Delivery: $300 for veterinary supervision, emergency availability, or immediate post-whelping check if the dam whelps at home without complications.

Whelping Costs - C-section: $2,500 for emergency or planned C-section including surgery, anesthesia, hospitalization, and post-operative care. With a 15% C-section rate, breeders should budget for this possibility.

Puppy Veterinary Costs: $150 per puppy for dewormings (multiple treatments), first vaccinations, and veterinary health certificate. For an average litter of 3.3 puppies, total puppy vet costs are approximately $495.

Food and Supplies: $200 for prenatal supplements for the dam, high-quality puppy food, puppy milk replacer (if supplementation needed), heating pads/whelping supplies, and disposable pads.

AKC Registration: $100 for litter registration plus individual puppy registrations.

Total Costs:

Natural whelping (average case): $3,020

C-section delivery: $5,220

Revenue Analysis:

Yorkshire Terrier puppies command premium prices reflecting the breed's popularity and high production costs.

Pet Quality Puppies: $2,000 average. Pet-quality puppies have minor conformation faults that make them unsuitable for showing or breeding (slight size deviation, ear set issues, coat texture variations) but are healthy and temperamentally sound. Pet puppies are sold with spay/neuter requirements.

Show Quality Puppies: $4,000 average. Show-quality puppies exhibit correct structure, excellent coat texture, proper color development, and confident temperament with breeding/showing potential. Many breeders co-own show prospects rather than selling them outright.

Average Litter Revenue: With 3.3 puppies average and conservative pricing at $2,000 per pet puppy, average revenue is $6,600 per litter. This assumes all puppies are sold as pets. If one puppy is show quality and sold for $4,000, with two pet puppies at $2,000 each, revenue reaches $8,000.

Net Profit/Loss Analysis:

Natural whelping scenario:

Revenue: $6,600 (3.3 puppies × $2,000)

Costs: $3,020

Net: +$3,580 per litter

C-section scenario:

Revenue: $6,600

Costs: $5,220

Net: +$1,380 per litter

Profitability Considerations:

The economics of Yorkshire Terrier breeding are significantly constrained by small litter sizes. While the net profit appears reasonable, several factors complicate the picture:

1. Small litters reduce economies of scale. Most costs (health testing, stud fee, progesterone testing, prenatal care) are fixed regardless of litter size. A litter of 2 puppies costs nearly as much to produce as a litter of 5, but revenue is cut by nearly half.
2. C-sections consume most profit. The 15% C-section rate means that 1-2 litters out of every 10 will have minimal profit or even losses.
3. Time investment is substantial. These figures do not account for breeder labor: monitoring the pregnancy, attending the whelping (often requiring round-the-clock supervision for 2-3 days), supplemental feeding if needed (every 2 hours for 2 weeks), puppy socialization, buyer communications, and post-placement support. The hourly compensation is minimal.
4. Not all puppies sell. Occasionally puppies remain unsold past 12-16 weeks, requiring extended care and additional vaccination/veterinary expenses.
5. Health testing is ongoing. Annual eye exams ($150/year) and periodic health monitoring for breeding stock represent ongoing expenses beyond per-litter costs.

Economic Sustainability:

Yorkshire Terrier breeding is rarely highly profitable. Breeders motivated primarily by financial gain will find better returns in breeds with larger litter sizes and lower production costs. Successful Yorkshire Terrier breeding programs are sustained by:

• Passion for breed preservation and improvement
• Pricing that reflects true production costs (quality pet puppies at $2,000-2,500)
• Selective breeding (2-3 litters per year maximum) rather than high-volume production
• Showing dogs to enhance reputation and justify premium pricing for show prospects
• Minimal overhead (home-based breeding without commercial facility costs)

Responsible Yorkshire Terrier breeding should be financially sustainable but should not be viewed as a significant income source. The small litter sizes and intensive care requirements make this a labor of love rather than a profitable business venture.

Breeder Resources

Yorkshire Terrier breeders have access to extensive support networks, educational resources, and community connections through national and regional organizations.

Parent Club:

The Yorkshire Terrier Club of America (YTCA) serves as the AKC parent breed club, providing comprehensive resources including breed standard interpretation, breeder education programs, health and genetics information, breeder directory and referral service, annual national specialty show, and regional specialty events. YTCA membership connects breeders with mentors, educational seminars, and the broader Yorkshire Terrier community.

Regional Clubs:

Yorkshire Terrier regional clubs operate throughout the United States, organizing local specialties, educational events, and social gatherings. These clubs provide opportunities to connect with other breeders in your area, attend judges' education programs, and participate in regional competitions. Contact YTCA for regional club contact information in your area.

AKC Breeder Programs:

AKC Breeder of Merit recognizes dedicated breeders who demonstrate a commitment to health testing, continuing education, and producing quality puppies. Requirements include health testing all breeding stock, producing at least four litters or five champions, and being an AKC club member for at least five years.

AKC Bred with H.E.A.R.T. Program (Health, Education, Accountability, Responsibility, Tradition) provides a framework for responsible breeding practices and offers breeders additional credibility and recognition.

Both programs enhance breeder reputation and provide marketing benefits when seeking puppy buyers who value responsible breeding practices.

Recommended Books:

• The Yorkshire Terrier Handbook by Sharon Vanderlip provides comprehensive coverage of breed history, health, grooming, and care
• The Complete Yorkshire Terrier by Joan Gordon and Janet Bennett offers detailed breed standard interpretation and breeding guidance
• Yorkshire Terrier Champions by Jan Linzy documents influential dogs and bloodlines

Online Communities:

• Yorkshire Terrier Club of America Facebook Group connects breeders nationally for discussion, advice, and networking
• YorkieTalk Forums provide active discussion boards covering breeding, health, showing, and general care topics
• Yorkies United offers breed-specific community and resources

Health and Genetics Resources:

• Orthopedic Foundation for Animals (OFA) maintains health testing databases and provides testing services
• Canine Health Information Center (CHIC) tracks health testing compliance
• OFA CHIC Breed Requirements page for Yorkshire Terriers lists required and optional tests

Mentorship:

New breeders are strongly encouraged to seek mentorship from established Yorkshire Terrier breeders. Many YTCA members mentor newcomers, offering guidance on breeding decisions, whelping preparation, puppy evaluation, and navigating the show ring. Attending regional specialty shows and YTCA national events provides opportunities to connect with potential mentors.

Continuing Education:

Yorkshire Terrier breeders should pursue continuing education through:

• YTCA educational seminars and judges' education programs
• Veterinary reproduction specialists and reproductive seminars
• Canine genetics courses (UC Davis offers online options)
• Grooming and coat care workshops specific to long-coated breeds

The Yorkshire Terrier community is generally welcoming to serious breeders committed to health testing, breed standard adherence, and ethical practices. Building relationships within this community provides invaluable support throughout a breeding career.

Frequently Asked Questions

How many puppies do Yorkshire Terriers typically have?

Yorkshire Terriers average 3.3 puppies per litter, with a typical range of 1-5 puppies. The breed's small size correlates with smaller litter sizes compared to medium or large breeds. Approximately 10% of litters consist of a single puppy, while litters of 5 puppies occur in about 15% of births. First-time dams often have smaller litters (2-3 puppies) compared to experienced mothers. The small litter size significantly impacts breeding economics, as fixed costs (health testing, stud fees, veterinary care) remain constant regardless of puppy count.

Do Yorkshire Terriers need C-sections?

Yorkshire Terriers have a 15% C-section rate, meaning the majority (85%) whelp naturally. However, certain risk factors increase C-section likelihood: dams under 4 pounds, single-puppy litters or very large individual puppies, weak uterine contractions (uterine inertia), and previous C-section history. Many Yorkshire Terriers successfully deliver naturally with proper monitoring and veterinary support. Breeders should establish emergency C-section availability before breeding, as dystocia can develop rapidly and require immediate surgical intervention.

What health tests are required for breeding Yorkshire Terriers?

CHIC (Canine Health Information Center) requires two health evaluations for Yorkshire Terriers: annual ACVO eye examination (CAER) screening for progressive retinal atrophy, cataracts, and other eye diseases ($150), and patellar luxation OFA evaluation performed at 12+ months ($75). Additionally, responsible breeders perform strongly recommended optional tests including bile acids test for liver function and portosystemic shunt screening ($150), Legg-Calve-Perthes OFA evaluation ($50), and thyroid panel ($120). Total CHIC required testing costs approximately $225 per dog, with comprehensive testing reaching $545.

How much does it cost to breed Yorkshire Terriers?

Complete Yorkshire Terrier breeding costs range from $3,020 for natural whelping to $5,220 for C-section delivery. Costs include health testing ($225), stud fee ($1,000), progesterone testing ($300), prenatal veterinary care ($400), whelping costs ($300 natural or $2,500 C-section), puppy veterinary care ($150 per puppy, approximately $495 for 3.3 puppies), food and supplies ($200), and registration ($100). These figures represent responsible breeding practices with comprehensive health testing and proper veterinary care.

At what age can you breed a Yorkshire Terrier?

Female Yorkshire Terriers should not be bred before 18-24 months of age, ideally on their second or third heat cycle. Although first heat occurs at 6-12 months, breeding at this age risks complications due to incomplete physical maturity. Males can be used for stud service starting at 12-18 months once health testing is complete. OFA patellar evaluation cannot be performed until 12 months, which should guide breeding timing. Recommended retirement age for females is 5-6 years, with a maximum of 4 litters per female across her breeding career.

How much do Yorkshire Terrier puppies cost?

Pet-quality Yorkshire Terrier puppies from health-tested parents average $2,000, while show-quality puppies with breeding potential average $4,000. Prices vary based on geographic location, breeder reputation, pedigree quality, and health testing documentation. Puppies from champion bloodlines or dogs with extensive health testing may command higher prices. Buyers should be cautious of significantly lower prices (under $1,000), which often indicate lack of health testing, poor breeding practices, or potential health problems. Responsible breeders provide CHIC numbers, health guarantees, and lifetime breeder support.

What are the most common health problems in Yorkshire Terriers?

The most prevalent health conditions in Yorkshire Terriers include periodontal disease (98% show early signs by 37 weeks), patellar luxation (26% prevalence), tracheal collapse (Yorkshire Terriers account for 65% of all cases), progressive retinal atrophy (5-10% prevalence), portosystemic shunt (3% prevalence but 36x higher risk than other breeds), Legg-Calve-Perthes disease (moderate in toy breeds), and hypoglycemia (common in puppies and adults under 4 lbs). Responsible breeding programs screen for patellar luxation, eye diseases, and liver function, while reviewing pedigrees for patterns of PSS and tracheal collapse.

Is breeding Yorkshire Terriers profitable?

Yorkshire Terrier breeding profitability is limited by small litter sizes. With average revenue of $6,600 (3.3 puppies at $2,000 each) and costs of $3,020 for natural whelping, net profit is approximately $3,580 per litter. C-section deliveries (15% of litters) reduce profit to $1,380. These figures do not account for breeder labor (pregnancy monitoring, whelping attendance, round-the-clock puppy care, socialization, buyer communications), which is substantial. Occasional unsold puppies, ongoing health testing for breeding stock, and time investment make Yorkshire Terrier breeding financially sustainable but rarely highly profitable. This is a labor of love rather than a significant income source.

Why is hypoglycemia such a concern in Yorkshire Terriers?

Hypoglycemia (low blood sugar) affects Yorkshire Terrier puppies and small adults due to their tiny size, high metabolic rate, and limited glucose reserves. Puppies weighing under 1 pound have particularly high risk during the 8-16 week period. Clinical signs include weakness, tremors, disorientation, seizures, and collapse. Causes include inadequate food intake, stress, illness, or prolonged periods without eating. Prevention requires feeding small, frequent meals (every 2-3 hours for young puppies), avoiding fasting, maintaining warm environmental temperature, and providing immediate glucose supplementation (Karo syrup, honey, or sugar water) at first signs. Breeders must educate puppy buyers about hypoglycemia recognition and emergency treatment.

What is the progressive graying gene in Yorkshire Terriers?

The progressive graying gene (G locus) causes Yorkshire Terrier coat color to transition from black to steel blue over 18-24 months. Puppies are born black and tan, with the black eumelanin in the saddle area gradually lightening to blue-gray as the dog matures. This is the same gene responsible for graying in other breeds but is fixed and uniform in Yorkshire Terriers. The blue color is not a dilution (which would be caused by the D locus) but rather progressive lightening of black pigment. Proper graying produces a rich steel-blue shade by maturity; dogs that gray too quickly may become pale silver (undesirable), while dogs that gray slowly retain excessive black past 3 years (also undesirable).

How do you prevent dental disease in Yorkshire Terrier breeding stock?

While 98% of Yorkshire Terriers show early periodontal disease signs by 37 weeks due to breed-specific jaw anatomy and tooth crowding, breeding stock dental health can be maintained through daily tooth brushing with dog-specific toothpaste, professional veterinary dental cleanings under anesthesia (annually or as recommended), feeding dental-specific diets or dental chews, avoiding sugary treats, and monitoring for tartar buildup, inflamed gums, and tooth mobility. Severe dental disease can affect systemic health and breeding success, as infections may impact pregnancy outcomes. Breeders should model good dental care practices and educate puppy buyers about starting dental care from puppyhood to minimize disease progression.

What size is too small to breed a Yorkshire Terrier?

Yorkshire Terriers under 4 pounds face substantially higher breeding risks including dystocia (difficult birth), hypoglycemia during pregnancy and lactation, complications from anesthesia if C-section is needed, producing excessively small puppies with high mortality risk, and difficulty recovering from the physical demands of pregnancy and nursing. Many veterinary reproduction specialists recommend against breeding females under 4 pounds. While the breed standard allows 4-7 pounds, ideal breeding stock weighs 5-6 pounds, providing adequate body reserves for healthy pregnancy while remaining within breed standard. Breeding for extremely small size ("teacup" marketing) is both unethical and dangerous, compromising health and welfare.