Merle is a distinguishing marking of several breeds, particularly the Alapaha Blue Blood Bulldog, Australian Shepherd, and appears in others, including the Koolie, German Coolies in Australia, the Shetland Sheepdog, various Collies, the Welsh Corgi (Cardigan), the Pyrenean Shepherd, the Bergamasco Sheepdog, the Poodle, the Pug, the Old English Sheepdog, American Bully, American Pit Bull Terrier, Chihuahua, Pomeranian, American Cocker Spaniel , and Catahoula Leopard Dog. In Dachshunds the merle marking is known as "dapple". The merle gene also plays a part in producing harlequin Great Danes and Beaucerons. If the dog was born in or before 2005 is the only way it can have ADBA paper work. ABKC considers merle a fault. However, they allow the registration and breeding of merle American Bullies.