How do you warm a dog sleeping in a doghouse outside in the winter?

You should put plenty of straw in the doghouse for the dog to cuddle up in. An insulated dog house also helps protect from the cold as does a flap on the door. The more that you can keep the cold out, the better. The dog should always have fresh, unfrozen water also. Feeding a larger amount of food helps because the dog uses more energy to keep warm and needs more nourishment to stay healthy.

Answer:

The first thing you want to do is to build the proper dog house for your dog. You want the dog house large enough for your best friend to be comfortable, but small enough for the dog to create enough body heat to help keep warm. Building an insulated dog house with a sealing door helps a lot. The floor of the dog house should also be insulated for best results. Having straw or a padded area for the dog to lay also is very helpful. One last thing will really help. You can install a dog house heater. These can be found on Amazon.