Description The Bull Terrier or English Bull Terrier is a breed of dog in the terrier family. The English Bull Terrier has a temperament that has been described as generally fun-loving, active. The Bull Terrier's most recognizable feature is its head, described as 'egg shaped' when viewed from the front, almost flat at the top, with a Roman muzzle sloping evenly down to the end of the nose with no stop. The unique triangle-shaped eyes are small, dark, and deep-set. The body is full and round, while the shoulders are robust and very muscular and the tail is carried horizontally. It walks with a jaunty gait, and is popularly known as the 'gladiator of the canine race'.