The American Bulldog is a large breed of utility dog descended from the now-extinct Old English Bulldog. American Bulldogs are known to drool more than other breeds of dog. They are competent swimmers unlike most other bulldog breeds, though they do not have the affinity for water a retriever would: they swim if they have to do it, not because they particularly enjoy it.They are capable of jumping in excess of 3 feet (0.91 m) vertically due to the dense muscle build of the breed and they love to run, jump, tackle and cavort. They are competent swimmers unlike most other bulldog breeds, though they do not have the affinity for water a retriever would: they swim if they have to do it, not because they particularly enjoy it.They are capable of jumping in excess of 3 feet (0.91 m) vertically due to the dense muscle build of the breed and they love to run, jump, tackle and cavort.