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, Australian Bulldog 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 (mixed colors, often in waves or irregular stripes), and piebald.Despite their fat "puss" expression, Bulldogs are generally docile and tractable. However, they can move very quickly over short distances. Bulldogs do not need a lot of physical exercise, so they are well-suited for living in apartments and other urban environments. They are friendly and gregarious, but occasionally willful. The phrase "stubborn as a Bulldog" may derive from observing an agitated Bulldog. They rank 78 out of 80 in Stanley Coren's The Intelligence of Dogs, holding the lowest degree of working/obedience intelligence.