on top of it in their cat shelter? I have a thin mylar sheet on top of a folded blanket in Muffin's cedar house, and it's filled with straw. We're going to be getting temperatures in the -5 zone a few nites next week and I want to take every precaution to keep him warm. I have another small pet house with a heating pad inside, but Muffin didn't use it at all last year and really likes his current house. I would like to put a pet heating pad in his cedar house and straw on top of it because he's accustomed to the straw, but I'm concerned it may be a fire hazard, though I don't think the straw would get that hot. Any suggestions?