PRA can be detected at any time but usually does not show up until the dog is around two years old. Breeding dogs should be tested for genotype for this condition before breeding and only animals found "clear" should be used for breeding. PRA can occur in most breeds of dog including mix breeds. In most breeds it is also an autosomal recessive condition, however it has been found in other breeds to be autosomal dominant and sex-linked in others. As the name suggests, it is a progressive disease which will eventually result in total blindness. Like CEA, an affected dog should not be bred with but these dogs can live happily as pets. Currently there is no treatment for either disease, but as both diseases (CEA and PRA) are hereditary it is possible to eliminate them using selective breeding.