What genetic health problems should Yorkshire Terrier owners watch for?
A practical guide to common genetic and breed-related health issues in Yorkshire Terriers — causes, signs, screening, treatment, and what owners and breeders can do to reduce risk.
Yorkshire Terrier genetic health: what owners need to know
Yorkshire Terriers are a popular toy breed known for their small size and big personality. Their size and breeding history make them predisposed to a handful of genetic and conformational health problems. This guide summarizes the most important conditions owners and breeders should know about—what causes them, how they present, how they're diagnosed and treated, and practical steps to reduce risk.
Primary sources for clinical guidance include the Merck Veterinary Manual, American Kennel Club (AKC) breed health resources, the American Veterinary Medical Association (AVMA), and specialty organizations such as the American College of Veterinary Ophthalmologists (ACVO) and the Orthopedic Foundation for Animals (OFA) (see references at the end).
Common genetic and breed-related problems in Yorkies (overview)
- Patellar luxation (kneecap dislocation)
- Portosystemic shunt (congenital “liver shunt”)
- Tracheal collapse
- Legg‑Calvé‑Perthes disease (avascular necrosis of the femoral head)
- Dental (periodontal) disease predisposition
- Hypoglycemia (especially in puppies)
- Progressive retinal atrophy (PRA)
Patellar luxation
What it is
Patellar luxation is instability or displacement of the kneecap (patella) — common in small and toy breeds, including Yorkshire Terriers. It ranges from intermittent slipping (grade I–II) to permanent dislocation with joint deformity (grade III–IV).[1]Signs
- Skipping or "floating" gait in the hind limb
- Holding a hind leg up for several strides
- Intermittent or persistent lameness
- Pain or late-onset arthritis with severe cases
Diagnosis
Diagnosis is by physical exam (orthopedic exam to feel the luxation and grade it) and radiographs to evaluate joint conformation and any arthritic changes.[1]Treatment
- Medical management for mild cases: weight control, joint supplements (omega‑3, glucosamine/chondroitin), NSAIDs for pain.
- Surgical correction for moderate to severe or recurrent problems: trochleoplasty, tibial tuberosity transposition, or soft-tissue reconstruction. Prognosis is generally good with appropriate surgery and rehab, though severe chronic cases can develop arthritis.
What owners and breeders should do
- Avoid breeding dogs with clinically significant luxation; obtain OFA (or equivalent) orthopedic evaluation and documentation. The OFA has a patella registry for screening results.
- Keep dogs lean, exercise appropriately, and seek early assessment for limping to catch problems before arthritis develops.
Portosystemic shunt (PSS, congenital liver shunt)
What it is
A congenital portosystemic shunt is an abnormal blood vessel that allows portal blood to bypass the liver. Small breeds, including Yorkshire Terriers, are overrepresented for congenital extrahepatic shunts. This reduces the liver’s ability to detoxify blood, causing systemic signs and potential life‑threatening complications.[2]Signs
- Poor growth or failure to thrive in puppies
- Neurologic signs (“hepatic encephalopathy”): disorientation, circling, seizures, head pressing
- Vomiting, diarrhea, decreased appetite
- Excessive drinking/urination, urinary stones
- Episodes often worsen after eating protein-rich meals (due to ammonia accumulation)
Diagnosis
- Bloodwork may show abnormal bile acids, low BUN, and elevated liver enzymes in some dogs.
- Pre- and post-prandial serum bile acid testing is a sensitive screening test.
- Definitive diagnosis is by abdominal imaging (ultrasound, CT angiography) or intra-operative portography to locate the shunt.[2]
Treatment
- Medical stabilization: low-protein diet, lactulose, antibiotics (to reduce gut bacteria that produce ammonia) for short-term management.
- Surgical attenuation (ligation or ameroid ring): preferred for long-term correction and good long-term outcome in many dogs. Outcome depends on shunt type (extrahepatic vs intrahepatic) and other factors.
What owners and breeders should do
- If you have a Yorkie puppy with poor growth, GI signs, or neurologic episodes, seek veterinary evaluation promptly and request bile acid testing and abdominal ultrasound.
- Breeders should screen litters and avoid breeding dogs that have produced puppies with confirmed congenital shunts.
Tracheal collapse
What it is
Tracheal collapse is a progressive weakening of the tracheal rings and the tracheal membrane causing airway narrowing. Small, barrel‑chested and toy breeds (including Yorkies) are predisposed.[3]Signs
- Honking cough (especially with excitement or pressure on the trachea)
- Exercise intolerance
- Respiratory distress in advanced cases (wheezing, open-mouth breathing)
- Worse with obesity, heat, or upper respiratory infection
Diagnosis
- Clinical signs and auscultation suggestive.
- Radiographs, fluoroscopy, and tracheoscopy (bronchoscopy) confirm location and grade of collapse.
Treatment
- Medical: weight loss, avoid collars (use harnesses), cough suppressants, bronchodilators, corticosteroids for inflammation, management of concurrent respiratory disease.
- Interventional/surgical: extraluminal rings (in cervical tracheal collapse), intraluminal stenting (endoluminal stents) for intrathoracic collapse — these carry risks and are reserved for severe cases.
What owners should do
- Use a harness rather than a collar for walks.
- Keep pets at a healthy weight and avoid exposure to smoke or aerosols.
- Seek veterinary care for a persistent cough; vets can recommend medical therapy and evaluate for advanced interventions if needed.
Legg‑Calvé‑Perthes disease (LCP)
What it is
LCP is avascular necrosis of the femoral head (hip joint) that leads to collapse and osteoarthritis. It is most common in small breeds, including Yorkies, and usually appears between 4–12 months of age.[4]Signs
- Progressive hind‑limb lameness, often unilateral at onset
- Muscle atrophy of the affected limb
- Pain on hip manipulation
Diagnosis
- Orthopedic exam and radiographs showing collapse or deformity of the femoral head.
Treatment
- Surgical femoral head and neck excision (FHO) is the most common treatment and provides excellent pain relief and return of function in small dogs.
- Conservative management (rest, pain control) may be tried in mild cases.
What owners should do
- Early veterinary evaluation for young Yorkies with hind limb lameness.
- Breeders should avoid producing affected puppies and document any history of LCP in pedigrees.
Dental disease predisposition
Why Yorkies are at risk
Small breeds have crowded dentition and relatively small jaws, increasing plaque accumulation and periodontal disease. Periodontal disease is the most common clinical problem in dogs overall and leads to pain, tooth loss, and systemic inflammation.[5]Signs
- Halitosis (bad breath)
- Red or bleeding gums, tartar build-up
- Reluctance to chew hard food or toys
- Loose or missing teeth in advanced cases
Prevention and treatment
- Daily tooth brushing is the gold standard. Use canine toothpaste and a soft brush.
- Regular veterinary dental exams and professional cleanings under anesthesia when indicated.
- Diet and dental chews/treats can help but do not replace brushing.
What owners should do
- Start tooth brushing early; even a few times per week is better than none.
- Schedule annual dental checks; consider earlier cleanings for dogs with heavy tartar or periodontal disease.
Hypoglycemia (especially puppies)
What it is
Hypoglycemia (low blood sugar) is a common emergency in toy-breed puppies, including Yorkies. They have limited glycogen stores and high metabolic rates, so prolonged fasting, stress, illness, or cold can precipitate dangerous hypoglycemia.Signs
- Lethargy, weakness
- Tremors, ataxia
- Seizures, collapse
- Pale mucous membranes, rapid breathing
Immediate actions (owner-focused)
- If the puppy is conscious and able to swallow: rub a small amount of corn syrup, honey, or sugar solution on the gums and get to a veterinarian immediately.
- If seizuring or unconscious: emergency veterinary care is required; do not attempt oral sugar if the puppy cannot swallow.
Prevention
- Feed frequent meals (small, regular feedings) in very young puppies.
- Keep puppies warm and avoid prolonged fasting during vaccination or illness.
- Monitor and seek prompt veterinary care for anorexia, vomiting, or diarrhea.
Progressive retinal atrophy (PRA)
What it is
PRA refers to a group of inherited retinal degenerations that cause progressive vision loss, often starting with night blindness and leading to complete blindness. Different genetic forms exist; some breeds have breed-specific mutations.[6]Signs
- Night vision problems, hesitance in dim light
- Progressive vision loss noticed by bumping into objects
- Dilated pupils and eventual retinal changes on ophthalmic exam
Diagnosis
- Eye exam by a veterinary ophthalmologist (ACVO diplomate) including ophthalmoscopy.
- Electroretinography (ERG) can detect early retinal dysfunction.
- DNA tests are available for some specific PRA mutations—if a known mutation exists for Yorkshire Terriers, genetic testing can identify carriers or affected dogs before clinical signs.[6]
Treatment and prognosis
- There is no cure for PRA; vision loss is progressive. Many dogs adapt well to blindness with owner support and environmental management.
- Dogs identified as carriers or affected should be managed responsibly in breeding programs.
What owners and breeders should do
- Have breeding stock ophthalmically examined by an ACVO specialist and perform any available DNA testing for PRA mutations relevant to Yorkies.
- For dogs going blind: maintain a consistent home environment, use verbal cues, and avoid moving furniture.
Screening, breeding recommendations and practical steps for owners
- Pre-breeding screening: orthopedic (patella grading via OFA), abdominal ultrasound/bile acids if there is concern for liver shunts in the line, ACVO eye exams, and any breed-specific DNA tests for PRA if available. Avoid breeding dogs with clear heritable disease or that have produced affected offspring.
- Keep toy and adult Yorkies lean and fit—obesity worsens orthopedic and respiratory conditions.
- Use harnesses, not neck collars, to protect the trachea.
- Establish a dental care routine early: daily brushing and regular professional cleanings as recommended.
- For puppies: frequent feeding, warm environment, and watch carefully for hypoglycemia signs.
- Build a relationship with a veterinarian experienced with toy breeds; early detection improves outcomes for many of these conditions.
When to call the vet (signs you should not ignore)
- Puppy lethargy, tremors, seizures, or collapse (possible hypoglycemia)
- Persistent cough, noisy breathing, or exercise intolerance
- Recurrent limping or pain in the hind limbs
- Poor growth, neurologic signs, vomiting after eating (possible liver shunt)
- Sudden changes in vision or confusing behavior in low light
- Foul breath, drooling, or pain when chewing (dental emergency)
Practical costs and prognosis (brief)
Costs vary by condition and region. Medical management for tracheal collapse and dental care are relatively lower-cost ongoing items; surgery for patellar luxation, femoral head osteonecrosis (FHO), or surgical correction of a portosystemic shunt can be several thousand dollars. Prognosis depends on the condition and its severity—many Yorkies do well with timely treatment and long-term management.Key Takeaways
- Yorkshire Terriers are predisposed to specific genetic and conformational problems: patellar luxation, congenital portosystemic shunts, tracheal collapse, Legg‑Calvé‑Perthes disease, dental disease, puppy hypoglycemia, and progressive retinal atrophy.
- Early detection through regular veterinary exams, specialty screening (ACVO eye exam, OFA orthopedic evaluation), and DNA testing where available improves outcomes and informs responsible breeding.
- Owners can reduce risk by keeping Yorkies lean, using harnesses not collars, instituting daily dental care, feeding puppies frequently to prevent hypoglycemia, and seeking prompt vet care for suspicious signs.
- Breeders should screen breeding stock and avoid producing affected puppies; buyers should request health clearances and ask about the parents’ health history.
References and further reading
- Merck Veterinary Manual. Breed predispositions and individual disease entries. https://www.merckvetmanual.com
- American Kennel Club (AKC) — Yorkshire Terrier health information. https://www.akc.org/dog-breeds/yorkshire-terrier/
- Orthopedic Foundation for Animals (OFA) — Patella and orthopedic screening. https://www.ofa.org
- American College of Veterinary Ophthalmologists (ACVO) — Owner resources and eye exam recommendations. https://www.acvo.org
- American Veterinary Medical Association (AVMA) — Dental care and anesthesia resources. https://www.avma.org
- VCA Hospitals — Client information on liver shunts, tracheal collapse, and other canine problems. https://www.vcahospitals.com
Frequently Asked Questions
Can I prevent genetic problems in my Yorkie puppy?
You cannot completely eliminate genetic risk, but you can reduce it by buying from responsible breeders who screen parents (orthopedics, eye exams, liver history), avoiding puppies from parents with known heritable disease, maintaining good nutrition and weight, and following preventive care (dental hygiene, frequent puppy feeding).
How soon should I see a vet if my Yorkie puppy is weak or shaky?
Any weakness, tremors, or seizures in a toy-breed puppy should prompt immediate veterinary attention. These can be signs of hypoglycemia, infection, or congenital disease; emergency stabilization and blood glucose measurement may be needed.
Are DNA tests available for PRA in Yorkies?
DNA tests exist for several forms of PRA in different breeds. Availability depends on the specific mutation affecting Yorkshire Terriers. Ask your veterinarian or a canine genetic testing service which tests apply to your dog and arrange testing before breeding.
When is surgery recommended for patellar luxation or Legg‑Calvé‑Perthes?
Surgery is recommended for moderate to severe patellar luxation (recurrent lameness or high-grade luxation) and for Legg‑Calvé‑Perthes in most cases to remove the collapsed femoral head (FHO), as surgery generally gives the best long-term function and pain relief.
References & Citations
Parts of this article reference data from Merck Veterinary Manual.