[sniskelsowwef]

This study compares human-dog jaw structure but the first paragraph addresses the pit bull.
http://www.glapbta.com/BFBP.pdf

Bite Force and Bite Pressure: Comparisons of Humans and Dogs
T E Houston, PhD (2003)“Jaws of steel!” “Locking jaws!” “A 2000 pound per square inch bite pressure.”
These are just a few of the plethora of statements describing the dog referred to
as the “pit bull”. The “pit bull” is a term encompassing several breeds, the
American Pit Bull terrier, the American Staffordshire terrier, the Staffordshire
terrier, and the Bull terrier. Other breeds or mixed breeds may be included due
to their physical resemblance to the pit bull. Every year the media hype
continues with a perpetual series of disinformation, myth, and distortions that
bedevil the bull breeds. The media bombards the public after a dog attack
incident perceived to involve one of the bull breeds. Descriptions of the incident
talk about ferocious bite pressures, quoting upwards of 2000 pounds per square
inch (psi). In another article, we read about the “scissors bite”, leading one to
believe this to be some sort of demonic configuration. Are the bull breeds
different? No! The American Pit Bull terrier and all the related bull breeds are
dogs. They are anatomically and physiologically no different from the Labrador
retriever or the poodle. All mammals have the same basic structures of the jaw.
Variations and adaptations are dependent on whether the primary diet isherbivore as with humans or carnivore as with dogs.