Ask if it could be diabetes. Excessive thirst and urination are one sign. My neighbor George (RB) had been diabetic for two years and got a daily insulin shot. Diabetes made his fur look dry and ragged. It also gave him a strange smell which could have been the ketones on his breath. His humans did their best to maintain him, and his behavior indicated that he had been loved well.

I hope it turns out not to be diabetes.