I have a four year old labordoodle named Harry. He has many health issues including; a liver that does not process animal protein and an over large heart. When he was one, I was told that he would not live to be two. He has beat the odds and was a healthy happy four year old until now. Lately I have noticed a loss in appetite. He usually will only eat pancakes. He empties about three large water bowls a day, but has a total loss in energy. Now every day he just sleeps, and he will not play. I looked up the symptoms of diabetes and he seems to have them. So what do I do if he has diabetes? Do I have to put him to sleep? And why is he not eating?