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Accidents, and excessive drinking can be a sign of bladder stones, diabetes, or a urinary tract infection.
The only way to determine stones or a UTI is to have a urine sample tested and since you were just at the vet you may be able to catch the first of the morning sample and drop it off for testing, that would be the easiest and least costly thing to do. IF there is a UTI then antibiotics will be needed and if there are stones then antibiotcs, and a change in diet will be needed. If you need to get antibiotics then ask for a prescription and take that prescription to Waldgreens or WalMart to be filled as this too will save you money.
Diabetes would also require testing as it is a disease of the pancreas. Insulin shots may be needed for this . You can read more on this here. http://www.vcahospitals.com/main/pet-health-information/article/animal-health/diabetes-mellitus-in-dogs/744