The Bull Terrier is a breed of dog in the terrier family originating in England. 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. Other names include Bully, Gladiator, English Bull Terrier. Bull Terriers can be both independent and stubborn, and for this reason are not considered suitable for an inexperienced dog owner. Check out our collection of Bull Terrier dog names for male or female puppies.