Found this while roaming around... It's a lawyers office that claims that pit bulls have 2600psi. This is where the article came from http://www.charlesboyk-law.com/practice_areas/dog-bites.cfm I e-mailed and asked them where they got their info. From what I've researched they tested Sch dogs, "who were trained to bite", many breeds including pitts, and none of them could exceed 350 psi. Also, all of the sites I've visited states, that the pittbulls jaws work just like any other dogs. There is no such thing as "lock jaw", it's a common myth. Has anyone heard any different?