Waidmann has a very good point.
in most cases pit pups are raised w/ the baydogs & dog aggression is discouraged from an early age. if the dog is incurable he either goes to a friend to be a pet or takes the long walk. also the breed is so popular over here and a lot have been bred from cold dogs. honestly the worst fights i've seen have been between baydogs. the bulldogs usually grab & hold and so there is less damage when one gets into a fight in the truck. hotshots (electric cattle prods) go ALONG way to eliminating any desire to fight among the dogs.
So does a 22 bullet dogs that fight are a waste of time and end up costing a lot of money. They maybe ok in your pack but if you want to hunt with other people it causes problems.
Bull Terriers are a great breed to X as they retain their hardness and can be built into almost any shape you want a dog with a bit more leg is good as it can move a bit faster and hold more efficiently as it can stand with all four legs on the ground so its not getting thrown round by the pig as much and can control it better.