The Bulldog is a very unique
breed that was originally bred for the purpose of attacking
bulls for entertainment (aka
bullbaiting). It's easily differentiated from other breeds and their
gentle manner makes them excellent companions.
A Bulldog is not the type of dog that will jog alongside you in the park or perform endless tricks. Like most any dog, it will do anything to please its master. They can be recognized by their large heads, flat nose and wrinkled face. The front legs and upper body are much larger than the rearend in a true show quality dog.
There is also a French Bulldog which much closer resembles a Pug than a traditional Bulldog. This could be because it is believed that Bulldogs came from cross-breeding the Pug and the Mastiff.