The Bull Terrier is a small muscular dog, especially around the shoulders the bull terrier is distinguished by its muzzle. Its most distinctive feature is its head, which is almost flat at the top, sloping evenly down to the end of the nose with no stop. The eyes are small, dark, almond-shaped and closely set. The body is full and round, while the shoulders are robust and muscular and the tail is carried horizontally. When properly trained tends to be friendly and have a good temperament. Known for his sense of humor he is an outgoing dog with a dominant nature who needs firm handling by his owner. A tenacious fighter, he is most often dog-aggressive and has a high prey drive towards small animals such as cats.