If your dog gets too cold, it will become lethargic and unresponsive. You should take notice if your dog seems to be shivering or has trouble walking. They could also feel cold on their paws or ears. When this happens, they need to get out of the cold area immediately so they can get warm again. If you see any of these signs in your dog, make sure to bring him inside where he can stay warm until you can find a way to fix the problem.