There are different types of PitBull Breeds and they are the most misunderstood breeds in the world.  PitBull Breeds do not have any way to lock their jaws. Their skull is made the same as any other dog breed. When purchasing any type of dog as a pet and family companion make sure you check the history of the bloodline of the dog you are getting.  Be sure to see the parents of the puppies to make sure thats what you are looking for. The PitBull Breeds can make a great family companion for the right family that has time to train!