Bred down in size from fighting dogs of the bull and terrier types, the Boston Terrier originally weighed up to 44 pounds (20 kg) (Old Boston Bulldogs). . According to the American Kennel Club, an ideal Boston Terrier should have white that covers its chest and muzzle, a band around the neck, halfway up the forelegs, up to the hocks on the rear legs, and a white blaze between (but not touching) the eyes. For conformation showing, symmetrical markings are preferred.