As winter blasts its way across the country, millions of outdoor dogs will take refuge in a doghouse. If your pet stays outdoors year-round, make sure that its miniature house is a warm and comfortable environment.

The ideal doghouse is usually no more than three times the size of the dog. This size is roomy enough for your pet to stand up, turn around, and lie down comfortably; yet small enough for your dog's body to warm the entire house.

For best insulation, the doghouse should sit 3-4 inches off the frozen ground. A four-sided base made out of 2x4s will lift the house off the ground and create an insulated air space for warmer air to circulate.

The doghouse should be carefully checked for cracks or a leaky roof. A wet house can be very cold and uncomfortable for your pet.

Since the wind can lower already bitter temperatures, it's best to put the doghouse in a place where the wind cannot come in the front door. The inside corner of a house or a fence can offer such protection. If there is no way to avoid the wind, a flap over the door will help. Many doghouses come with an inside baffle to block the direct flow of air.

You and I consider blankets comfortable bedding. However, they are not necessary for our pets. Dogs often are perfectly happy with wood chips, straw, or carpeting. Towels or rags may also be used; but don't be surprised if your dog "rearranges the furniture" and you find the bedding out in the yard.

Finally, make sure that the doghouse has a hinged top to make it easier to clean out and change the bedding.

If yours is an indoor pet, his crate or bed should be kept in a warm, draft-free area, preferably elevated slightly off the floor.

The writers are Dr. Steven B. Holzman, Dr. William R. Haagenson and Dr. Kathleen Tapley. They are associated with the Nassau-Suffolk Veterinary Hospital of Farmingdale.