Dog raincoats keep your dog dry. While you might think your dog doesn’t need a coat when the temperatures warm up, they can still get cold under the right circumstances. Here’s the way it works. When water evaporates, it cools the air, dissipating heat. If your dog gets wet and then dries off, they don’t lose that much body heat. However, if they stay wet for an extended time, their body continues to lose heat, eventually leading to the shivering response.