The Boxer is a breed of medium-sized, short-haired dogs developed in Germany. Their coat is smooth and tight-fitting; colors are fawn or brindled, with or without white markings, which may cover the entire body, and white. Boxers are brachycephalic (they have broad, short skulls), have a square muzzle, mandibular prognathism (an underbite), very strong jaws, and a powerful bite ideal for hanging on to large prey. The Boxer was bred from the Old English Bulldog and the now extinct Bullenbeisser, and is part of the Molosser group. The Boxer is a member of the Working Group.