The jaws just aren't «constructed» to lock, but an academic study, «Cranial dimensions and forces of biting in the domestic dog,» shows that the bigger and wider the skull, the stronger the bite. (goodpitbulls.com)
The force of each bite was like a sledge hammer with teeth. (relevantmagazine.com)
For the first time, scientists have calculated the force of the bite of a white shark. (discovermagazine.com)