The Shetland Sheepdog, often known as the Sheltie, is a breed of herding dog that originated in the Shetland Islands of Scotland. This breed was formally recognized by The Kennel Club (UK) in 1909. While the Sheltie still excels at herding, today it is often raised as a farm dog and/or family pet. The long, rough guard hairs lie on top of a thick, soft undercoat. 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.