Genetic Screening for Breeders: What It Tests For and How to Use the Results

Genetic screening tells a breeder whether an individual dog or cat carries the specific gene mutations known to cause hereditary diseases in its breed, before that animal is ever bred. The test result sorts each animal into one of three categories, clear, carrier, or affected, and that category should directly shape whether and how the animal is used in a breeding program. Skipping this step does not make the underlying genetics disappear. It just means the breeder finds out about a hereditary condition after it shows up in a litter, rather than before.

This matters most in breeds with a known, well documented set of hereditary conditions, which by now includes nearly every popular purebred dog and cat breed. A single screening panel, run once per breeding animal before its first litter, is a small cost against the alternative: producing puppies or kittens that develop a painful or shortening condition that responsible testing would have flagged in advance.

What genetic screening actually detects

A genetic screening panel looks for specific, previously identified DNA mutations known to cause disease in a given breed, not for genetic health in general. This is an important distinction: a clear result on a hip dysplasia gene panel says nothing about whether that dog will develop hip dysplasia from environmental and polygenic factors, which imaging based evaluation through OFA or PennHIP still needs to check separately.

Panels typically cover disease screening, testing for mutations linked to conditions like progressive retinal atrophy in dogs or hypertrophic cardiomyopathy in cats, and separately, parentage and trait testing, which verifies lineage and predicts physical traits like coat color rather than disease risk. Breeders often run both because they answer different questions: is this breeding pair going to reliably produce healthy offspring, and separately, does the resulting litter match the coat colors and patterns a breed standard or waiting list of buyers expects.

A screening panel is also not a one time purchase in the way a single vet visit is. Most reputable labs update their panels as researchers identify new disease causing mutations in a breed, so the list of conditions covered today is usually longer than it was even two or three years ago. Breeders working with a breed that has had a mutation identified recently should check whether their existing test results need to be supplemented rather than assuming an older panel is still complete.