The American Bulldog is a large breed of utility dog descended from the now-extinct Old English Bulldog. The Bully type is generally a larger, heavier dog with a shorter muzzle, but the muzzle should never be so short that it causes difficulty with breathing. Standard types are generally more athletic with longer muzzles and a more square head. Many modern American Bulldogs are a combination of the two types, usually termed 'hybrid.' A tall fence is a must to keep an American Bulldog from wandering off on an adventure and forgetting how to get home, so a microchip is highly recommended.
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