Dilute colors can include blue, blue-fawn, fawn, etc. White-haired areas are not affected. Many dilute IG's retain a full hair coat all their lives. CDA affected dogs should not be bred. Dogs with undescended testicles are at greater risk of developing testicular cancer, and should be neutered at an early age.
Vision loss is normally progressive, and eventually results in total blindness.
A veterinary ophthalmologist who examines the eye may be able to detect changes in an affected IG at two to three years of age. PRA is known to be hereditary nature in nature. It is inherited as a simple recessive which means that two normal dogs may be carriers of the gene, and when bred together can produce an affected dog. Any dog which produces an affected dog is a carrier and should no longer be bred. In addition, affected dogs and their littermates should not be used as breeding stock.