My 12 year old sheltie and been listing to the side and hiding behind TV and in corners. I took her right to the vet because I had a Lab/Shepherd that passed with a brain tumor a year ago and she had some of the same symptoms. The vet diagnosed her with colitis. She hasn't had any diarrhea and is still eating very well. She seemed a little confused and in some pain. The vet gave her a shot and put her on a soft food diet. She seems a little more alert but still is listing and going behind furniture. Has anyone had a sheltie that had colitis but didn't have diarrhea? She does grunt when you pick her up but she has arthritis as well. Does anyone have any advise?