DNA Health Testing for Stud Dogs: Which Tests Actually Matter?

Genetic testing has become central to responsible breeding — but knowing which tests matter for your breed is half the battle

Walk into any dog breeding conversation today and DNA health testing comes up within minutes. Embark, Paw Print Genetics, UC Davis, Animal Genetics — testing panels are more accessible and affordable than ever. But more testing is not always better testing, and the wrong panel on the wrong breed gives a false sense of security.

This guide explains what DNA health testing actually measures, which tests matter for the most common breeds, and how to interpret results when you are evaluating a stud dog.

What DNA Testing Measures (and What It Doesn't)

DNA testing for dogs identifies specific genetic variants — mutations in the dog's DNA that are associated with inherited diseases. The tests are looking for particular sequences at particular locations in the genome.

What DNA testing can tell you:

• Whether a dog carries one or two copies of a disease-associated mutation
• Whether a dog is at risk for specific genetic conditions
• Coat color and pattern genetics
• Breed composition (in mixed-breed dogs)

What DNA testing cannot tell you:

• Whether a dog has hip dysplasia (requires X-ray evaluation)
• Whether a dog has heart disease (requires cardiac evaluation)
• Whether a dog has eye disease (requires ophthalmologist examination)
• General health or longevity

DNA testing is one part of a comprehensive health evaluation. It is not a substitute for physical examinations and imaging.

Understanding Test Results: Clear, Carrier, and Affected

Most genetic disease tests return one of three results:

Clear (N/N): The dog has zero copies of the disease-causing mutation. He cannot be affected by this condition and cannot pass the mutation to his offspring.

Carrier (N/Mut): The dog has one copy of the mutation. He is not affected by the disease (for recessive conditions) but can pass the mutation to offspring. Breeding a Carrier to a Clear mate is safe — offspring will be either Clear or Carriers, but never Affected.

Affected (Mut/Mut): The dog has two copies of the mutation and will develop the condition (for recessive conditions). Affected dogs should not be bred.

The critical rule: never breed two Carriers together. A Carrier-to-Carrier breeding produces, on average, 25% Affected puppies, 50% Carriers, and 25% Clear — unacceptable outcomes for any responsible breeding program.

The Most Important DNA Tests by Breed

Golden Retriever

• PRA-prcd (Progressive Rod-Cone Degeneration) — Most important DNA test for Goldens. Clear or Carrier acceptable if bred to a Clear mate.
• Ichthyosis — Skin condition common in the breed. Clear or Carrier acceptable.
• Degenerative Myelopathy (DM) — Neurological disease. Carrier-to-Carrier matings should be avoided.

Labrador Retriever

• PRA-prcd — As in Goldens
• Exercise-Induced Collapse (EIC) — Particularly relevant for working and field Labs
• Degenerative Myelopathy (DM)
• Centronuclear Myopathy (CNM) — Muscle disease specific to Labs
• Hereditary Nasal Parakeratosis (HNPK) — Skin condition specific to Labs

French Bulldog

• Degenerative Myelopathy (DM)
• Canine Multifocal Retinopathy 1 (CMR1)
• Hyperuricosuria (HUU) — Affects uric acid metabolism, can cause bladder stones
• Juvenile Hereditary Cataracts (JHC)
• Color genetics — Merle, dilute (d locus), and fluffy (FGF5) are increasingly important in French Bulldog breeding

Australian Shepherd

• MDR1 (Multi-Drug Resistance 1) — Perhaps the most clinically important test for Aussies. Affected dogs have a severe sensitivity to ivermectin and several other common medications, potentially fatal if administered. This is not just a breeding concern — it is a veterinary safety issue for the dog himself.
• Hereditary Cataracts (HSF4)
• Collie Eye Anomaly (CEA)
• Progressive Retinal Atrophy (PRA-prcd)
• Degenerative Myelopathy (DM)

Poodle (Standard, Miniature, Toy)

• PRA-prcd — Critical for any Poodle used in hybrid programs
• Degenerative Myelopathy (DM)
• Neonatal Encephalopathy with Seizures (NEWS) — Standard Poodle-specific
• Von Willebrand's Disease Type I (VWD1) — Particularly relevant in Toy and Miniature Poodles
• Osteochondrodysplasia (OCD) — Affects Toy Poodles

Cavalier King Charles Spaniel

• Degenerative Myelopathy (DM)
• Episodic Falling (EF)
• Macrothrombocytopenia — Benign low platelet count common in CKCSs, not disease but often flagged on bloodwork
• MVD and SM/CM are not DNA-testable — they require cardiac evaluation and MRI

Dachshund

• Intervertebral Disc Disease (IVDD) — The most important test for the breed. The CDDY/IVDD mutation greatly increases risk of disc herniation. A two-copy (homozygous) dog carries significantly higher risk than a one-copy or zero-copy dog.
• PRA-prcd
• Degenerative Myelopathy (DM)

German Shepherd Dog

• Degenerative Myelopathy (DM) — Extremely common in the breed. DM is a progressive, fatal neurological disease. Two-copy (Affected) dogs should not be bred.
• MDR1
• Exocrine Pancreatic Insufficiency (EPI)

Which DNA Testing Companies Are Reliable?

For stud dog evaluations, insist on tests from accredited laboratories:

• Paw Print Genetics — Highly regarded for breed-specific disease panels
• Embark Veterinary — Consumer-friendly but also offers breeder-level disease testing with excellent breed coverage
• UC Davis Veterinary Genetics Laboratory — Academic lab offering a wide range of tests
• Animal Genetics — Widely used for coat color and disease testing

Avoid tests from unaccredited or unknown labs. Results from questionable sources are not worth the paper they are printed on.

Coat Color Genetics: When It Matters

Coat color testing is increasingly requested for stud dogs, particularly in breeds where color genetics are commercially relevant (Merle Aussies, Frenchies, Doodles). A few color-genetic tests have direct health implications:

Merle (M locus): Homozygous merle (Mm bred to Mm, producing some MM offspring) is associated with blindness, deafness, and severe developmental defects. Never intentionally breed merle-to-merle.

Dilute (d locus): Dogs with two copies of the dilute gene (dd) may be more susceptible to Color Dilution Alopecia, a skin and coat condition.

These are the only color genetic tests with significant health implications. All other color testing is relevant to predicting puppy appearance, not puppy health.

Summary

DNA health testing is a critical component of responsible stud dog evaluation, but it only covers genetic conditions — not hip, elbow, heart, or eye health, which require separate physical evaluations. Know which tests matter for your specific breed. Insist on results from accredited laboratories. And understand what Clear, Carrier, and Affected mean before making breeding decisions. A well-tested stud dog gives you confidence in the health foundation of every puppy in the litter.