So American Pit Bull Terriers have the highest bite pressure of the canine world. NOPE.

Not according to the National Geographic program.

When Dr. Brady Barr of National Geographic (Dangerous Encounters: Bite Force, 8/18/2005) measured the bite forces of three dog breeds (Rottweiler, German Shepherd Dog and American Pit Bull Terrier) using a computerized bite sleeve, the American Pit Bull Terrier generated the least amount of pressure out of the 3 dogs tested

http://www.youtube.com/watch?v=R7jhrxy0HKs

Here are the top 6 animals of the world with the highest bite pressure according to the National Geographic Channel:

1. Crocodiles: 2489 lbs
2. Hyenas: 1123 lbs
3. Snapping Turtles: 1098 lbs
4. White sharks: 620 lbs
5. Lions: 611 lbs
6. Wolfs: 458 lbs

There is no scientific evidence showing pit bulls to have a stronger bite than other large dog breeds. Period