just make sure that you don't put something in the dog box that the dog will eat....My dog, for instance, I would not trust with anything but hay, straw, or shavings...Which have worked great for me...and work great for 1000's of sled dogs in Alaska...LOL
Dogs are much tougher than we give them credit for....I bring mine in when it gets much below zero (10 below or colder, although I used to wait til it was 20 below or colder to bring him in).....and he is usually panting within a half hour....In fact I have recently begun putting him in his crate in the back of the truck at night, because it is cooler for him than being in the house, but a little warmer than just the dog house...of course, he is a chessie! LOL
Juli