I have a 10 week old male Doberman puppy weighing 20 pounds. He drinks a lot of water! Most of the day is spent going outside to pee and as soon as he comes back in drinks more and has to go back out to pee. During the day if he's in his cage for even an hour he will pee. I limit his water intake in the evening before bed and he makes it through the night without peeing in his cage. I have read it is not good to limit their water intake during the day. What is normal and should I take him to the vet for this problem?