Health Testing Before Breeding Dogs: Which Tests Actually Matter
If you are considering breeding your dog, health testing is not optional — it is the foundation of responsible practice. Yet the world of pre-breeding screening can feel overwhelming, with dozens of available tests and conflicting advice from breeders, vets, and online forums. Understanding which tests carry genuine scientific weight and which offer limited practical value will help you make decisions that genuinely protect the puppies you produce.
Why Health Testing Exists
Domestic dogs carry a significant inherited disease burden, partly as a consequence of selective breeding for appearance and behaviour over centuries. Closed registries, popular sire effects, and small founder populations have concentrated certain mutations within breeds. Health testing aims to identify carriers or affected dogs before they contribute to the next generation, progressively reducing the frequency of harmful variants in the gene pool.
The key distinction is between tests that screen for conditions with clear breeding protocols and tests that produce interesting data without reliable guidance on what to do with it. The former are worth prioritising; the latter deserve more scepticism.
Schemes with Established Breeding Protocols
Hip and Elbow Dysplasia
Hip and elbow scoring through the British Veterinary Association (BVA) and the Kennel Club remains one of the most evidence-based screening tools available. Dogs are radiographed and scored against a reference population. Breeding from dogs with scores below the breed mean reduces the incidence of dysplasia over generations, though the polygenic nature of the condition means progress is gradual. Elbow dysplasia is assessed separately using a 0–3 grading scale. Both schemes require dogs to be at least 12 months old at the time of assessment.
Eye Examination
The BVA/Kennel Club/International Sheep Dog Society (ISDS) Eye Scheme screens for inherited eye conditions including hereditary cataract, progressive retinal atrophy (PRA), and multifocal retinal dysplasia. Annual examinations by a BVA-approved ophthalmologist are recommended for breeds on the scheme list, as some conditions can develop with age. Results are recorded and certificates issued, providing traceability.
DNA Tests for Single-Gene Conditions
For conditions caused by a single gene variant with known inheritance patterns, DNA testing offers the clearest guidance. A dog is tested as clear, carrier, or affected. Clear-to-clear matings produce no affected offspring. Clear-to-carrier matings produce no affected offspring but will generate some carriers. Carrier-to-carrier matings risk producing affected puppies and should generally be avoided unless there are exceptional reasons, such as preserving a very small population.
The conditions worth testing vary by breed. Labrador Retrievers should be screened for exercise-induced collapse (EIC) and progressive retinal atrophy. Border Collies should be tested for Collie eye anomaly (CEA) and TNS. Cavalier King Charles Spaniels have schemes for both mitral valve disease (MVD) and syringomyelia. The Kennel Club maintains breed-specific testing lists that are updated as new research emerges and are a reliable starting reference.
Cardiac Screening
For breeds predisposed to inherited heart disease, cardiac auscultation by a BVA-approved cardiologist forms part of the recommended protocol. The MVD Breeding Protocol for Cavalier King Charles Spaniels, for instance, recommends that neither parent should have a murmur before a certain age and that both parents' parents should also be murmur-free at specified ages. This is a population-level strategy designed to delay the onset of disease in offspring rather than eliminate the gene entirely.
Tests with Less Actionable Outcomes
Not every available test translates into clear breeding decisions. Some commercial DNA panels include conditions where the variant tested has low penetrance — meaning many dogs carrying the variant never develop the disease. Others test for conditions so rare in certain breeds that the result carries little practical meaning. This does not mean the tests are useless, but it does mean a positive carrier result should not automatically disqualify a dog from breeding without further discussion with a specialist.
Whole-genome sequencing and extended health panels can provide useful background information, but interpreting their output requires genetic literacy that goes beyond a simple pass or fail. Working with a veterinary geneticist or a breed health coordinator when results are complex is strongly recommended.
The Role of Breed Health Coordinators
Each Kennel Club registered breed has a breed health coordinator who monitors health trends and advises on testing protocols. These coordinators compile data from health surveys and liaise with researchers, meaning their guidance reflects what is genuinely relevant for that breed rather than a generic list. Consulting them before breeding is one of the most underused resources available to breeders.
Timing Matters
Several tests must be completed within specific timeframes to be valid. Hip and elbow scores require the dog to have reached skeletal maturity. Some eye conditions require annual re-examination. Cardiac protocols specify the ages at which both the dog and its parents must be assessed. Completing tests too early or failing to repeat time-limited screens invalidates their usefulness and can give a false sense of security.
Building a Testing Plan
A sensible approach begins with the Kennel Club's breed-specific health testing requirements and recommendations, distinguishes between mandatory tests for assured breeder status and those that are advisory, and then consults with your vet and the breed health coordinator before making any breeding decisions. Testing both potential parents, not just one, is essential — screening only the stud dog while leaving the dam untested is a common but significant oversight.
Health testing represents a genuine commitment of time and money. It also represents a commitment to the dogs you produce and the families who will care for them. In breeds where certain conditions are common, the cumulative impact of widespread testing on the next generation's health is measurable and real.