the study was done by Dr. Brady Barr of National Geographic Channel (Dangerous Encounters: episode title = Bite Force)
watch the video here:
http://www.youtube.com/watch?v=R7jhrxy0HKs
the result:
- Humans: around 120 pounds of bite pressure
- Domestic dogs: 260 LBS of pressure on average. 5 of each breed was tested for mor accuracy, German Shepard, Mastiff, Labrador, Huskie, American Pit Bull Terrier (APBT) and Rottweiler were tested using a bite sleeve equipped with a specialized computer instrument. The APBTs had the least amount of pressure of the 3 breeds tested and the ROTTWEILERs... uhmmm, well, just watch the video