My 7 year old shih tzu started having seizures on Christmas eve. She is on phenobarbitol for them. The vet I saw said the most likely cause is a brain tumor. The last few days she is drinking a lot more than usual. She is also utinating and having frequent bowel movements.I had her out twice this morning. I had to go out and she urinated on the floor. This is highly unusual for her. It is occuring more often. My suspision is kidney failure. My question is. Is she suffering? She doesn't show signs of pain but is getting a little crabbier. She normally has a great disposition. Just a little spoiled. She has now started panting when she needs to go out. This she has never done before.