Until the early part of the 19th century; the Bulldog was bred with great care in England for the purpose of baiting bulls. The Bulldog of that day was vastly different from our present-day "sourmug." Pictures from as late as 1870 represent the Bulldog as agile and as standing straight on his legs-his front legs in particular. In some cases he was even possessed of a muzzle, and long rat tails were not uncommon. The Bulldog of that day, with the exception of the head, looked more like the present-day American Staffordshire Terrier than like the present-day Bulldog. 

Some writers contend it was the white English Terrier, or the Black-and-Tan Terrier, that was used as a cross with the Bulldog to perfect the Staffordshire Terrier. It seems easier to believe that any game terrier, such as the Fox Terrier of the early 1800s, was used in this cross, since some of the foremost authorities on dogs of that time state that the Black-and-Tan and the white English Terrier were none too game, but these same authorities go on to stress the gameness of the Fox Terrier. It is reasonable to believe that breeders who were attempting to perfect a dog that would combine the spirit and agility of the terrier with the courage and tenacity of the Bulldog, would not use a terrier that was not game. In analyzing the three above-mentioned terriers at that time, we find that there was not a great deal of difference in body conformation, the greatest differences being in color, aggressiveness, and spirit.