when my dog started to drink water and pee all over the place we took her to the vet and found out that she was diabetic. so now she is limited to 2 feedings a day with 3 units of insulin with each meal.
please post what it turns out to be if it isnt psychological.
and good luck. the good news is since we found out my doggie is fine and has lived with it for almost 2 years now (she is 13)