Why Do Dogs Snap Their Jaws. Dogs communicate in a variety of strange and unusual ways. Teeth clicking can also even indicate pure excitement in canines, without any nervousness.
The thing is, dogs have coats of fur, which stops teeth getting through to the skin and drawing blood if they nip and snap at each other, so puppies and dogs can use snapping as a perfectly safe way of saying “play with me!” to one another. Why do dogs snap their jaws? In fact, the scientists found no unique feature on a pit bull that would allow them to lock their jaws.