The Bull Terrier is a breed of dog in the terrier family. They have large, egg-shaped heads, and small triangular eyes. There is also a miniature version of this breed which is officially known as the Miniature Bull Terrier. The Bull Terrier's most recognizable feature is its head, described as 'egg shaped' when viewed from the front, the top of the skull is almost flat from ear to ear. Profile curves gently downwards from top of skull to tip of nose which should be black and bent downwards at tip. Nostrils are well developed and under-jaw deep and strong snout. 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. They are generally white in colour, walk with a jaunty gait, and are popularly known as the 'gladiator of the canine race'. Bull Terriers are known to be courageous and active.