The Dog Breed Info Center lists more than 40 types of bulldogs, including the American bulldog, Australian bulldog, English bulldog, French bulldog and Victorian bulldog. Other breeds of bulldog include miniature varieties of Australian and English bulldogs and combinations of two breeds, such as the American French bulldog.

Bulldogs originated from fighting dog breeds, such as the Greek Molossian dogs and the British pugnace britannicii, which were used in battle. The many breeds available today have evolved to adapt to their working and living conditions or have been bred for specific settings. Bulldogs have strong, square builds and large heads with short muzzles. Their threatening appearance makes them good guard dogs, and their sweet temperament allows them to thrive in a family setting.