Progressive retinal Atrophy (sloughi type) is a late onset, inherited eye disease affecting sloughi dogs. Progressive retinal atrophy (sloughi type) occurs as a result of degeneration of both Rod and cone type Photoreceptor Cells of the Retina, which are important for vision in dim and bright light, respectively. The rod type cells are affected first and dogs present around 2 to 3 years of age with vision deficits in dim light (night blindness) and loss of peripheral vision. Over years affected dogs continue to lose night vision and begin to show visual deficits in bright light. Other signs of progressive retinal atrophy involve changes in reflectivity and appearance of a structure behind the retina called the Tapetum that can be observed on a veterinary eye exam. Although there is individual variation in age of onset and the rate of disease progression, the disease generally follows a slow progression and dogs may or may not become completely blind.