Managing Inherited Cataracts in Dogs: A Practical Guide for Labrador Retriever Breeders
This guide helps Labrador Retriever breeders decide whether to use a dog, its offspring, or its siblings for breeding when cataracts appear in the pedigree. It distills the key decision points into plain language.
Key Points for Breeders
The inheritance of Labrador Retriever cataracts is not fully understood. Dominant inheritance with incomplete penetrance has been proposed, but incomplete penetrance strongly suggests that the condition is genetically complex (polygenic). No DNA test exists for the Labrador's hereditary cataract, so decisions must rely on a specialist's eye exams, accurate diagnoses on siblings, and complete pedigree history. Estimated breeding values (EBVs), which combine a dog's own results with its relatives' across the pedigree, offer a more informative risk estimate than any single exam.
Not every cataract is inherited, but the default is to assume it is. Cataracts caused by trauma, inflammation, diabetes or other metabolic disease, nutritional deficiencies, or old age are not inherited. The American College of Veterinary Ophthalmologists (ACVO) treats any cataract as inherited unless the examining ophthalmologist identifies one of these causes.
Cataracts can also be a sign of progressive retinal atrophy (PRA). PRA is inherited, and an affected dog should only be bred when its genotype has been determined by a genetic test and the resulting matings will avoid producing affected puppies. A DNA test for prcd-PRA, the form found in Labrador Retrievers, identifies carriers and affected dogs, and should always be done alongside the eye exam, especially if a young dog is being considered for breeding.
Every prospective breeding dog should be examined by a board-certified veterinary ophthalmologist, and re-examined every year while it is being bred. Hereditary cataracts are usually first seen at 1–3 years of age but can appear at any age. An informal assessment or a non-specialist exam is not sufficient for breeding decisions.
A dog diagnosed with an inherited cataract should not be used for breeding, and should be retired going forward if it has already produced litters.
An affected dog can often still work faithfully for years. The typical Labrador cataract is small and may not affect sight in its early stages. Some progress, however, so an affected dog should stay under a veterinarian's care.
Offspring of an affected parent face increased cataract risk, though not every puppy will be affected.
Offspring of an affected parent can still be considered for breeding if individually cleared by a board-certified ophthalmologist.
A full sibling of an affected dog is not automatically excluded from breeding, provided that sibling is independently examined and certified normal by a specialist.
A Simple Decision Framework
Has this dog had an eye exam by a board-certified veterinary ophthalmologist within the last year?
If yes, were its eyes certified normal?
If a cataract was found, did the ophthalmologist attribute it to a specific non-inherited cause? If not, treat it as inherited.
What is this dog's prcd-PRA DNA test result?
If a parent or full sibling has a diagnosed inherited cataract, has this dog nonetheless been independently examined and cleared?
A dog without a recent specialist exam should not be assumed clear based on appearance alone. A dog with an affected relative should not be automatically excluded from breeding if independently cleared.
A Note on Genetic Risk
A clear eye exam does not rule out genetic risk entirely — it only means no clinical evidence was found at that time. Many programs therefore weigh cataract history across several generations, not just the individual dog and its immediate relatives. This is where EBVs add the most value, since they summarize risk across a pedigree rather than from one exam. An accurate EBV, however, requires sufficient examination data across enough related dogs; one built on sparse data is no more informative than a single exam.
For a plain-language summary of the peer-reviewed literature behind these recommendations — including prevalence data, the distinction between primary hereditary cataracts and cataracts secondary to conditions like progressive retinal atrophy, and ACVO Genetics Committee breeding guidance — see Genetic Inheritance of Cataracts in Labrador Retrievers: A Practical Summary of the Peer-Reviewed Literature, by Eldin A. Leighton, PhD.