Bulldog is the name for a breed of dog commonly referred to as the English Bulldog. Other Bulldog breeds include the American Bulldog, Olde English Bulldogge, and the French Bulldog. The Bulldog is a muscular, heavy dog with a wrinkled face and a distinctive pushed-in nose. The American Kennel Club (AKC), The Kennel Club (UK), and the United Kennel Club (UKC) oversee breeding standards.
The Bulldog is a breed with characteristically wide head and shoulders along with a pronounced mandibular prognathism. There are generally thick folds of skin on a Bulldog's brow; round, black, wide-set eyes; a short muzzle with characteristic folds called rope above the nose; hanging skin under the neck; drooping lips and pointed teeth, and occasionally an underbite. The coat is short, flat, and sleek, with colors of red, fawn, white, brindle, and piebald.
In the UK, the breed standards are 50 pounds for a male and 40 pounds for a female. In the United States, a typical mature male weighs 45 to 55 pounds. Mature females weigh in at about 45 pounds.
Bulldogs are one of the few breeds whose tail is naturally short and either straight or screwed and thus is not cut or docked as with some other breeds. A straight tail is a more desirable tail according the breed standard set forth by the BCA if it is facing downward, not upward.
Source of information: http://en.wikipedia.org/wiki/Bulldog
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