The Bulldog,also known as the English Bulldog or British Bulldog, is a medium-sized dog breed. It is a muscular, hefty dog with a wrinkled face and a distinctive pushed-in nose.The Kennel Club (UK), the American Kennel Club (US), and the United Kennel Club (US) oversee breeding records. Bulldogs are popular pets; they were the fifth most popular purebreed in the US in 2017 according to the American Kennel Club

Bulldogs have characteristically wide heads and shoulders along with a pronounced mandibular prognathism. There are generally thick folds of skin on the brow; round, black, wide-set eyes; a short muzzle with characteristic folds called a rope or nose roll above the nose; hanging skin under the neck; drooping lips and pointed teeth, and an underbite with an upturned jaw. The coat is short, flat, and sleek with colours of red, fawn, white, brindle, and piebald.

Breed standards are 55 lb (25 kg) for a male and 50 lb (23 kg) for a female.
Mature male weighs 50 lb (23 kg), while mature females weigh about 40 lb (18 kg).
The Bulldog Club of America recommends the average weight of a bulldog to be 40–50 lb (18–23 kg)