OCD Dog?

Anyone with any tips for this...<br><br><br><br>My dog is 12, she has an obsession with drinking water. We have taken her to the vet twice for this, and she is completely healthy. She is not diabetic like both vets assumed before they did the testing.<br><br>It's gotten worse lately... she now barks in the middle of the night to get out of my room so she can drink MORE. I do put a full bowl in my room so she has water with her food, but I can't put loads in or she's just going to end up barking because she's going to need to go outside...<br><br>I have no idea how to break a habit like this. Her barking has been waking everyone in the house up but my dad and I. Mom thinks it's just because she's old and may be...ya know, getting into an old dog mind >.> Iunno about that though, she's perfectly fine outside of that. She's not acting like she's confused or anything like Shelby started to act when she got older.<br><br>Any suggestions?