Why Has My Dog Suddenly Started Drinking A Lot Of Water?
Apart from the obvious things, such as exertion or exposure to salt or excess heat, excessive drinking can be one of the first symptoms of diabetes, urinary tract disorders and poisoning. But before you jump to any conclusions you must first check to see if there are any other changes:
If no changes have been made, then there is a problem -- one you cannot treat. You need to see your vet as soon as possible..