YouTube artist Zupf created a video about the "pit bull locking jaw" controversy that advocates frequently refute. Due to artificial selection for the purposes of dogfighting, pit bulls developed a killing bite. Unlike other dog breeds, pit bulls "hold and shake" their victims. Unless a 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 either.
Zupf references the Baltimore Sun pit bull street fighting video (See: Pit Bull Fight), which depicts pit bulls "locked on" to each other in a curbside fight. On the DogsBite.org Dog Attack Videos page, we show examples of this bite behavior as well. The combination of a pit bull’s powerful jaws, the "hold and shake" bite style -- designed to inflict maximum damage -- and the pit bull's unmatched tenacity is partly why cities, counties and entire countries regulate these dogs.
04/17/09: Crow Bar Used to Unlock Pit Bull's Jaws Engaged in Fight
02/24/09: 2008 International Shark Attack Report Released
01/06/09: Ecuador Joins International Trend: Bans Pit Bulls and Rottweilers as Pets
09/29/08: Break Sticks: A Tool Used to Pry Open a Pit Bull's Jaws