While theexistence of a dog with ABCA4-associated retinopathy was verylikely due to the extensive genetic variability not only in the humanABCA4 locus but also in other mammals, the search wassuccessful only very recently, when when several Labrador retrievers were identifiedand characterized as a KO for ABCA4 (Makelainen et al., 2019). The gene discussed is ABCA4; the disease is retinal disorder.