DNA Testing for Dogs: A Comprehensive Guide
Genetic testing has revolutionized responsible dog breeding over the past two decades. What once required expensive, invasive blood draws and weeks of waiting now involves simple cheek swabs and results within days. This guide covers everything breeders and owners need to know about DNA testing for dogs.
Why Test?
Genetic testing serves multiple purposes in modern dog breeding and ownership:
Health Screening
Many serious health conditions have genetic components that can be detected before symptoms appear. Testing breeding stock helps prevent producing affected puppies. Examples include progressive retinal atrophy (PRA), degenerative myelopathy (DM), and von Willebrand disease.
Carrier Detection
For recessive conditions, carrier detection is crucial. Carriers appear completely healthy but can produce affected offspring when bred to another carrier. DNA testing identifies carriers, allowing breeders to make informed pairing decisions.
Drug Sensitivity
The MDR1 mutation affects drug metabolism in herding breeds. Knowing a dog’s status before any medication is administered can prevent serious adverse reactions.
Breed Verification
DNA testing can confirm breed ancestry, which is particularly valuable for breeding stock or when breed-specific legislation is a concern.
Coat Color and Trait Prediction
Color and trait testing helps breeders predict litter outcomes and identify carriers of recessive colors. Our guide to coat color genetics explains the specific genes that determine canine coat color and pattern.
Sample Collection
Most DNA tests use cheek swabs, making collection easy and painless. For accurate results:
Before Collection
- Ensure the dog has not eaten or had treats for at least two hours
- If testing a puppy, wait until weaning is complete
- Have multiple swabs ready in case of contamination
Collection Process
- Use firm pressure when swabbing the inside of the cheek
- Rotate the swab while rubbing against the cheek tissue
- Collect for the full time recommended (usually 30-60 seconds per swab)
- Allow swabs to air dry completely before packaging
After Collection
- Package according to laboratory instructions
- Submit promptly to avoid sample degradation
- Keep your order confirmation for tracking
Choosing a Laboratory
Several factors differentiate testing laboratories:
Test Selection Laboratories vary in which tests they offer. Ensure your chosen lab tests for conditions relevant to your breed. Some labs offer comprehensive panels, while others focus on specific diseases.
Turnaround Time Results may take from one to four weeks depending on the laboratory and tests ordered. Consider timing if results are needed before breeding decisions.
Result Reporting Look for laboratories that provide clear, understandable results with explanations of what each finding means. Good laboratories also provide support for interpreting complex results.
Quality Certifications Reputable laboratories participate in quality assurance programs and may be certified by organizations like the American Association of Veterinary Laboratory Diagnosticians.
Registry Reporting Some laboratories can report results directly to breed registries like OFA (Orthopedic Foundation for Animals), streamlining the health certification process.
Understanding Results
Test results typically fall into several categories:
Clear/Normal The dog has two normal copies of the gene. For recessive conditions, these dogs will not develop the condition and cannot pass on the mutation.
Carrier The dog has one normal copy and one mutated copy. Carriers typically do not develop symptoms but can pass the mutation to offspring. When bred to another carrier, approximately 25% of puppies will be affected.
Affected/At Risk The dog has two copies of the mutation. For most conditions, this means the dog will develop or is at significantly increased risk of developing the condition.
Some results use different terminology:
- N/N = Normal/Normal (Clear)
- N/M = Normal/Mutant (Carrier)
- M/M = Mutant/Mutant (Affected)
Breeding Decisions Based on Results
Responsible use of genetic testing does not necessarily mean removing all carriers from the breeding pool. This approach can dangerously narrow genetic diversity, particularly in numerically small breeds already affected by genetic bottlenecks.
General Guidelines
Affected dogs should generally not be bred, particularly for serious or debilitating conditions.
Carriers can be bred if paired with clear dogs. All offspring will be either clear or carriers, with no affected puppies produced.
If a carrier possesses exceptional breed qualities, breeding to a clear partner preserves those qualities while preventing affected puppies.
Document all testing and share results with puppy buyers.
Consider the Condition
For serious, early-onset, painful, or fatal conditions, stringent breeding restrictions are appropriate.
For late-onset or manageable conditions, more flexibility may be reasonable while still avoiding producing affected puppies.
For non-health traits (like coat color), decisions can prioritize preference without health concerns.
Important Limitations
Testing Does Not Guarantee Health
DNA testing detects specific known mutations. Many health conditions, including polygenic disorders like hip dysplasia in herding breeds, have complex genetic components not captured by current single-gene tests. Additionally, environmental factors influence health outcomes, and research into epigenetics and gene expression is revealing how environment and experience shape a dog’s biology beyond its DNA sequence.
Tests Evolve
New mutations are regularly discovered. A test that was comprehensive five years ago may be incomplete today. Stay current with testing recommendations for your breed.
False Results Occur
While rare, laboratory errors happen. For critical breeding decisions, consider retesting or confirming with a second laboratory if results seem inconsistent with known parentage.
Not All Breeds Need All Tests
Each breed has specific conditions of concern. Work with your breed club or veterinarian to determine which tests are most relevant. For herding breeds specifically, our article on genetic mutations common in herding breeds provides breed-specific testing recommendations. For Rough and Smooth Collies, a comprehensive overview of required tests is available in our Collie genetic health guide. Breeders interested in the most complete genomic picture should also read our introduction to whole-genome sequencing for dogs.
Record Keeping
Maintain organized records of all genetic testing:
- Store physical and digital copies of result certificates
- Record test dates and laboratories used
- Track which dogs have been tested for which conditions
- Update records as new tests become available and are performed
Share testing information with:
- Puppy buyers (provide copies of parent results)
- Co-owners or co-breeders
- Breed registries that maintain health databases
- Your veterinarian
Cost Considerations
Test prices vary significantly. Comprehensive panels may offer better value than individual tests if multiple screenings are needed. Some breed clubs negotiate group rates with laboratories.
Consider testing costs as part of responsible breeding expenses. The cost of testing is minimal compared to the cost of producing or owning dogs with preventable genetic conditions.
Conclusion
DNA testing is an essential tool for modern dog breeders and an increasingly valuable resource for pet owners. The technology continues to advance, offering more tests with faster results at decreasing costs. The future of canine genomic medicine promises even more powerful tools, from whole genome sequencing to gene therapy and precision diagnostics.
By incorporating genetic testing into breeding programs and sharing results transparently, breeders can significantly reduce the incidence of hereditary diseases while maintaining the genetic diversity essential for breed health. Some breeders are actively collaborating with researchers to advance canine genetics. Amandine Aubert of Bloodreina in France publishes complete genetic panels for her White Swiss Shepherd breeding pairs, contributing valuable data to our understanding of breed-specific genetic markers.
Consult with your veterinarian or a veterinary geneticist for guidance on which tests are most appropriate for your breed and breeding goals. For specific questions about testing herding breeds, feel free to contact our team for personalized recommendations.