My 9 month old bloodhound/French mastiff has recently started drinking what seems to me an excessive amount of water. I have a 2.5 gallon automatic water dispenser and I find myself refilling it every other day sometimes more often. I've heard that large dogs are prone to bloating from excessive eating and drinking which can be harmful. I'm not entirely sure if that's true but it got me a little worried so I stopped filling the 2.5 gallon jug and just started filling up a bowl to try and prevent him from drinking so much water. Well now he's constantly wanting to go outside (every 15-30 min) just to eat the snow! I'm not sure if he just drinks a lot of water because he's such a large dog but I've lived with a Great Dane before and he never drank that much water. I started to think maybe he has diabetes but his energy level is the same as always. Are there any other reasons he could be drinking this much water or am I just being paranoid?