Lower Jaw

Question
Hi,
I adopted a 7 year old Sheltie last Sept.  She's wonderful, love her very much.

I just started noticing for some reason her lower part of her mouth (jaw) quivers or vibrates , I don't really know how to describe it, but when she does this her teeth click together a bit.  It stops after a bit, but I never had or seen a dog that did this before.

Doyou think it's something serious?

Answer
Hey Debbie. Hmmmm... Since she's a bit of an old girl, it might be that she's just getting old. It doesn't sound like anything serious to me. As long as she's eating, drinking, going to the bathroom, & feeling normal; I wouldn't worry a/b it. Let me know if it gets worse. Thanks!
-Heather