Thank you all so much for your thoughtful answers. I like the idea of more insulation underneath and will look into the other materials mentioned and we'll figure something good out. Did I not mention that he must be claustrophobic or something because he's had a full covered dog house made for him, but he refuses to use it - he's obviously cold bc he's shivering and all, but he will not go inside it. That's why we're thinking just raise the sides up to help block some wind.
Thanks, again for all the input!
Bookmarks