Last weekend, my Penny stayed at the sitters for four days. She came home and had diarrhea every hour. The next day she did not eat anything. I took her to the vet and he couldn't find anything wrong. She has been on rice and chicken for few days. She still has diarrhea. She poops every time I take her out and has a few accidents inside. She is peeing a lot more. She walks with her tail between her legs. Should I take her to the vet again?