Hi Kathy
I am here, bit late logging in tonight. You sure it is not just trembling, Flynny does that on occasion. It used to just be in his back legs but sometime includes the rest of him, head included. I see his ears wobbling.

Isn't it always the worst, middle of the night and you fears get the better of you! Try get some sleep and see how he is tomorrow. They do seem to get aches and pains at different times. I have Flynn on a very small dose of Tramadol now, 12.5mg twice a day and it seems to be holding his arthriticy pains pretty good!