American Bulldogs are muscular, athletic, and big-boned. Both males and females have large, broad heads with small to medium ears. They have strong jaws and a slightly undershot bite. Most American Bulldogs are white but can come in white and black, white and brindle, and white and tan. The shoulders and chest of an American Bulldog tend to be the most muscular parts of the dog, and they have short, smooth coats. An American Bulldog’s tail is naturally short to medium length and may be straight or slightly curved.