I will say two things of a very general nature: I watched a program comparing the bites of several breeds of dogs and alligators. The dogs' bites, using pounds per square inch registered at around 320 to 330 pounds per square inch while the alligators' were hovering at around a thousand PSI.
Secondly, about the pitbull: This breed is of and by itself a pretty docile animal; it is just that so many individual pitbulls have displayed ferocious and dangerous behavior BECAUSE their trainers/owners/handlers have taught them to be that way! That can be done with any breed of dog. Stupid Homo Sapiens!