Despite their fur coats, pets can get cold in the winter months especially short haired breeds. Try and keep outdoor cats in on cold winter nights.
If your dog is an outside dog, and you don't want to bring him indoors, make sure he has insulated shelter from wind and rain, and warm, dry bedding in his kennel.
Make sure that the water in his bowl is not frozen.
If you take your dog for walks in the snow, be sure to get some booties to protect his paws. Be sure and dry your pet after walks in the rain or snow.