From my copy of The Complete Dog Book page 264:
“Anyone who has read about the sport of ‘bull baiting’ must have been conscious of its extreme cruelty. From this we can gather that the original Bulldog had to be a very ferocious animal. Beauty and symmetry of form were in no way desirable, the appearance of the dog counting for nothing. The extraordinary courage possessed by these dogs is hardly believable. Bred from a long line of fighting ancestors, they grew to be so savage, so courageous as to be almost insensitive to pain. Such was the Bulldog of British sporting days.”
See my post # 35 above and follow the link to my description of when I saw a pit bull attack a horse.