No dog on the face of the earth has "locking jaws" I have done the research and it has shown that it is impossible for a pit's (or any dog's) jaws to lock. How would they eat or play? Also, has there ever been any documentation of a pit's locked jaws that were stuck there? Because everthing has a tendency to fail in a life time, I would imagine this would happen. However, any mastiff family breed (Pit's, Staffys, boxers and bulldog's) are extremely strong animals. Their heads are like blocks and their jaws are massive with huge fist size muscles that control the hinge joint of the jaw. So, if they are determined to play and hang on like they do with the spring pole, they will for as long as they want to (supporting their own weight while thrashing about). These dogs were used for bull baiting and for hunting bear with their master. If they can take down a bear or contain a bull, they are crazy strong! And, they are great family members too! Train them right and they will be no different that the black lab down the road. Good luck and do your research!
Yes it does because in the olden days it used to be a fighting dog .And all of the other muscular breeds like the pitbull , bullterriers and so on, the are bull dog crosses. AKON