Are these pees of normal size or small? If he is *also* drinking a lot more AND peeing in normal or large quanities of pee (rather than small puddles), then I really would get more testing done. Excessive drinking and peeing is one of the first reasons owners bring their pets in when they have Cushing's Disease...believe me...just went through it. I doubt it's that, but it is something to consider. It can also be a sign of Diabetes.
Urinating Frequently (Polyuria) Can Be a Sign of Serious Disease in Pets