Drinking more water than usual

First of all, drinking plenty of water is fine for your health and thirst, but excessive thirst could be a sign that your dog suffers from polydipsia. Polydipsia also leads to increased urination. This is a vicious cycle because pets that suffer from diabetes will urinate a lot and the more they do this, the more dehydrated and thirstier they will be, and this is why they drink plenty of water. 

“Oftentimes owners will think they are urinating more because they’re drinking more, but it’s actually the other way around,” says Dr. Romine. “As the dog urinates more and more, they will start to become dehydrated, so they drink larger and larger amounts to keep up.”