Thank you very much for his helpful advice and I believe that he may be at stage 4 only because the vet stated the the enzyime levels were the highest seen. However, his appetite was okay until today bu unfortunately he has not eaten or attempted to drink tonight but he did want a walk. He hasn't vomited and is not moaning in pain. Although, I do not want him in pain and if I thought he were, my decision would be easy, do you, in your opinion, think that he may be in pain or not??