Progressive Retinal Atrophy is a gradual disease and not present at birth. It eventually leads to blindness. Hip dysplasia is rare in the Shetland Sheepdog due to the Shelties light build. Von Willebrand's disease is a blood disorder that has been seen in Shelties. This disease interrupts the blood's ability to clot and can be very serious for the Sheltie undergoing surgery or even having its toe nails trimmed.
Signs are loss of hair in matching patterns, laziness, and gaining weight easily.
Medications can be prescribed to help keep this disease in check. The best way to assure you are getting a quality Shetland Sheepdog is to contact the Reputable Dog Breeders Association in your area for a listing of Sheltie breeders.