If the car is left running, your pet could die from breathing in carbon monoxide. Also, pets are often stolen from unattended vehicles. If your dog is sensitive to the cold because of age, illness, or breed type, take him outdoors only long enough to relieve himself. Windchill makes days colder than actual temperature readings. Be attentive to your dog's body temperature and limit time outdoors.
Companion animals are easily susceptible to frostbite.
Puppies do not tolerate the cold as well as adult dogs and may be difficult to housebreak during the winter. If necessary, paper train your puppy inside if he appears to be sensitive to the weather. If your dog spends a lot of time engaged in outdoor activities, increase his supply of food, particularly protein, to keep his fur thick and healthy. Provide plenty of fresh water. Your dog is just as likely to get dehydrated in the winter as in the summer.