Igloo houses are gaining popularity fast. While they might be hard to find regardless your dog size, having one of them in your backyard is considered stylish. Igloo dog houses reviews from owners of different dog types are mostly positive.
Best Dog House in June 2017 - Dog House Reviews
I haven't put a thermometer in the dog house to see how warm it is, but when I put my hand in there, it feels warm. I have an Igloo house (Dogloo II) with a door and also I put some bales of straw in front of the door to block the wind even further. From all the reviews I have read online, most people like this heater for their dog house. It's been bitterly cold here in TN lately so I'm glad I got the heater when I did. I would recommend getting one for maximum comfort for you dog. We're still sort of evaluating ours but so far, I like it.
Introduction to the Dog House Reviews
Igloo Dog Houses: Why Dogs Love Them + Our Top Picks - K9 of Mine