when i got my fat cat he was so cold he cried all night. i filled a large tupperware with hot hot hot water before his bedtime, covered with a towel and tucked the ends under. i plopped that cat right on the heated tupperware. he slept through the entire night. i'll bet if you dressed your dog in a baby or child sweatshirt and then plopped him on a hot water container, he'd be as warm as toast. covered with a blanket, he'd be toast.