We have a lab. It's been cold out (Live in MO) and he won't go in his box. Wife caught him on his blanket, in the middle of the driveway, in the sun. at night he comes in the house, but during the day and it's it's really cold, he won't go in. Anyone got any ideas how I can get him to stay in his box? I can get him to GO in, but the problem is getting him to stay in.