Remember, if you are uncomfortable outside, so is your pet. Also, feeding your pet adequately (twice daily during winter months), will keep his core temperature up, therefore, help him stay warm. The function of digestion (homeostasis process) actually raises the pets body temperature. Water is just as important. Cold weather dehydrates. Refill frozen water as needed. And last of all, look deep within yourself and ask the question; "What kind of person am I, if I allow my pet to suffer horribly outside, while I sit comfortably inside?"