Quivering Jaw

What does a quivering jaw or shaking jaw mean?

My 2 year old pit/boxer mix's jaw shakes after sniffing the ground in the house & another dog has been over. Has this happened to anyone else?

Gale's Reply:

I have seen this behavior with my male dogs at times after sniffing a female. It's a response to picking up a scent that interests or excites them. From your description, it sounds like this is what is going on with your dog.

But, to be thorough, I did a little research. And, jaw quivering or teeth chattering can also be a sign of dental problems or of seizure activity. So, a dog who does this in the absence of a scent cue should be checked by a vet.