Duke is going to go back to the vet

Well he hasn't gotten any better and now he is drinking water like a fish. So on Saturday morning we are going to take him back to the vet to see what is going on. I am afraid that it might be his kidneys. But at least I can rest in the fact that we have done everything for this dog and if this is his time then he had as good of a life that we could have given him.