The Rhodesian Ridgeback is a dog breed bred in the Southern Africa region. Its forebears can be traced to the semi-domesticated, ridged hunting dogs of the Khoikhoi, which were crossed with European dogs by the early colonists of the Cape Colony of southern Africa. The original breed standard was drafted by F. R. Barnes, in Bulawayo, Southern Rhodesia. Some breed parent clubs and canine registries in Europe have even made the culling of ridgeless whelps a requirement. Hypothyroidism is a growing problem in the Rhodesian Ridgeback, and this condition causes a multitude of symptoms, including weight gain and hair loss. Treatment for hypothyroidism in dogs consists of an inexpensive once-daily oral medication.