I thought my lexi was shaking because she was cold after surgery (three days later) ended up taking her to the vet and she had caught a little virus she had a fever and would not eat or drink.  Two shots and sent home with amoxcillian and she was much better in a couple of days.  She was spayed on the last day of feb. And back to her wonderful self now.  just watch the shakes 

  hope she is much better soon