Colors, while historically predominantly white with patches of red, black, or brindle, have grown in recent years to include many color patterns including black, red, brown, fawn, and all shades of brindle. Some writers contend it was the White English Terrier, Fox Terrier, or the Black and Tan Terrier that was crossed with the Bulldog to develop the Staffordshire Terrier; all three breeds shared many traits, the greatest differences being in color, and spirit. The cross of Bulldog and Terrier was called by several names, including Bull-and-Terrier Dog, Pit Bull, or Half and Half. Later, it assumed the name of Staffordshire Bull Terrier in England. The color conformation is quite varied, but solid black or any degree of merle is considered a cosmetic fault, and a blue color is a disqualification by the NKC Breed Standard. In coated to coated matings, all puppies will be coated.
It is not uncommon for an American Bulldog to require a high level of attention due to their highly emotional personality. It is important to note that many modern American Bulldogs are a combination of the two types usually termed "hybrid." In general, American Bulldogs weigh between 27 to 54 kg (60 to 120 lb) and are 52 to 70 cm (20 to 28 in) at the withers, but have been known to greatly exceed these dimensions, especially in the "out of standard," nonworking stock. The cross of Bulldog and Terrier was called by several names, including Bull-and-Terrier Dog, Pit Bull, or Half and Half. Later, it assumed the name of Staffordshire Bull Terrier in England. The American Cocker Spaniel is a breed of sporting dog. The distinct American Hairless Terrier breed began in 1972 when one hairless puppy named Josephine appeared in a Rat Terrier litter in the state of Louisiana, United States.