Ichthyosis in Golden Retrievers: DNA Testing and Breeding Guide

Ichthyosis (ICH-A) is a skin disorder affecting Golden Retrievers, caused by a mutation in the PNPLA1 gene. The condition produces scaly, flaky, and thickened skin — particularly on the belly and trunk — that resembles fish scales (hence the name, from the Greek for fish). While not life-threatening, ichthyosis is uncomfortable and requires lifelong management.

What Is Ichthyosis?

In healthy skin, the outer layer continuously sheds and regenerates. In dogs with ichthyosis, this shedding process is disrupted — dead skin cells accumulate rather than naturally sloughing off, causing the characteristic scale buildup. Golden Retriever ichthyosis typically begins showing at 2–4 weeks of age and becomes more obvious over time.

Signs:

• White to grey flaking on the belly, inner thighs, and sides
• Thickened, rough skin texture
• Occasional dark pigmentation of flaky areas
• Susceptibility to secondary skin infections

Genetics and Test Results

ICH-A is autosomal recessive — two copies of the mutation produce an affected dog.

Clear (N/N): No ichthyosis mutation — will not develop the condition and cannot pass it to offspring

Carrier (N/ICH-A): One copy — clinically normal skin, but can pass the allele to offspring. Carrier x carrier pairings produce 25% affected offspring.

Affected (ICH-A/ICH-A): Two copies — will develop ichthyosis

Prevalence

Carrier frequency in Golden Retrievers is remarkably high — studies estimate 50% or more of Golden Retrievers carry at least one copy of ICH-A. This means the mutation is extremely widespread and cannot be eliminated quickly from the population.

Breeding Recommendations

Because carrier frequency is so high, some breed health authorities advise that carriers can be bred to clear dogs (producing no affected offspring), and that breeding away from ichthyosis should be a gradual, generational goal rather than an immediate priority. Breeding decisions should consider the overall health merit of both dogs — eliminating all carriers would discard far too much of the breed's genetic diversity.

Do not breed two affected dogs. Carrier x clear pairings are appropriate for maintaining genetic diversity while moving the population toward lower carrier frequency over time.

Testing Labs

DNA testing for Golden Retriever ichthyosis is available from PawPrint Genetics, Embark (within their health panel), Laboklin, and Animal Genetics. OFA publishes results when submitted.