The bulldog is a breed of dog with characteristically thick shoulders and a head to match. A bulldog is an incredible way to get your exercise and enjoy yourself. An adult bulldog can range in size anywhere from 45 to 55 lbs and are about a foot and a half in height. English bulldog puppies. There is no breed of dog better than bulldogs. They are just great with small kids due to their docile nature and live about 8 years old depending on who you ask.