The bulldog is a breed of dog with unusually thick shoulders and a head to match. An english bulldog is an amazing way to get your exercise and enjoy yourself. A fully grown bulldog can vary in size anywhere from 45 to 55 pounds and are approximately 1 and a half feet tall. bulldog puppies. There is no breed of dog better than bulldogs. They are great with small kids because of their docile nature and live about 10 years old depending on who you ask.