Check out this snippet from the breed standard for the bull terrier from the AKC: The dog's head should be "egg-shaped." Their eyes should be sunken and dark, small and triangular, with a "piercing glint." And their ears should be small, thin and close together.
Good thing these dogs have a sense of humor. Temperament-wise, bull terriers are charming, playful and mischievous and are typically very friendly with a sweet disposition. They make great family pets and are loyal to their favorite people.