The Bull Terrier is a breed of dog in the terrier family. 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 head', when viewed from the front; the top of the skull is almost flat. The profile curves gently downwards from the top of the skull to the tip of the nose, which is black and bent downwards at the tip, with well-developed nostrils. The lower jaw is deep and strong. The unique triangular eyes are small, dark, and deep-set. Bull Terriers are the only dogs that have triangular eyes. The body is full and round, with strong, muscular shoulders. The tail is carried horizontally. They can be white, red, fawn, black, and brindle.

Bull Terriers can be both independent and stubborn and for this reason are not considered suitable for an inexperienced dog owner. A Bull Terrier has an even temperament and is amenable to discipline. Although obstinate, they are particularly good with people. Early socialisation will ensure that the dog will get along with other dogs and animals. Their personality is described as courageous, full of spirit, with a fun-loving attitude, a children-loving dog and a perfect family member. Although the breed has been a target of breed-specific legislation, a 2008 study in Germany didn't find that Bull Terriers have any significant temperament difference from Golden retrievers in overall temperament researches.

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