That's just one quote from a source regarding Pit Bulls. And that's a pro Pit Bull website too. So perhaps I used the term lockjaw incorrectly but they don't bite like regular dogs.Due to artificial selection for the purposes of dogfighting, pit bulls developed a killer bite. Unlike other dog breeds, pit bulls “hold and shake” their victims. Unless a crow bar or break stick is used to pry open a pit bull’s jaws, shooting the dog may be the only way to get the animal to release. Though the pit bull’s jaws may not “structurally” lock, they do not release naturally