How do you fix lockjaw in dogs?

Perhaps you should do some research on "pit bulls", because this lockjaw that you speak of is myth.

Quote: "The few studies which have been conducted of the structure of the skulls, mandibles and teeth of Pit Bulls show that, in proportion to their

size, their jaw structure and thus its inferred functional morphology, is

no different than that of any [other] breed of dog. There is absolutely

not evidence for the existence of any kind of 'locking mechanism' unique

to the structure of the jaw and/or teeth of the American Pit Bull Terrier,

says Dr. I. Lerh Brisbin of the University of Georgia (from the ADBA booklet, 'Discover the American Pit Bull Terrier.)'"