A Bulldog, which is also known colloquially as the English Bulldog or British Bulldog, is a medium-size breed of dog that originated in England. The bulldog is a stocky breed, with a compact body and short, sturdy limbs. Its shape results in a peculiarly unique gait. Bulldogs are known for their short muzzles and the saggy skin on their faces, creating the apparent "frown" that has become a trademark of the breed. Bulldogs come in a variety of colours and ideally have a smooth, short coat. In the US, the size for a mature male is about 50 pounds; that for mature females is about 40 pounds. In the United Kingdom, the breed standard is 55 pounds for a male and 50 pounds for a female.
The temperament of the Bulldog is generally docile, friendly and gregarious but are known to be fiercely loyal. Breeders have worked to breed aggression out of the breed, and as such the dog is known to be of generally good temperament. Bulldogs can be so attached to home and family that they will not venture out of the yard without a human companion. Due to their friendly nature bulldogs are known for getting along well with children, other breeds of dog and any house-broken pet in general.A bulldog is suitable for houses as well as apartments due to their size and comparative lack of energy, but puppies may be destructive until they reach maturity.