You know, my girl does that sometimes. Usually she has been licking herself (like when she is in heat) and then her jaw quivers uncontrolably for a little bit.
His blood sugar isnt getting low is it?
I am sure I have been unhelpful, but just wanted to let you know my dog does it too and I dont think you need to overly worry about it.
__________________  Bella (I miss you)  Sachi  Emmy |