not so much as the house but kids that ruin dogs ,but it does help if you harden of your terrier to the out side conditions ,a dog that uesd to the nice warm fire all day will feel the cold when out ,in fact a bet a house dog will not want out of the house on a very cold day even for a piss unless it gets a boot up its arse and when it is out i bet its back at the door trying to get in from the cold in no time ,what good is that if your going out digging all day and the dog is standing about ready to go to ground waiting its turn ,if it goes to ground that is ,i bet its thinking of its nice wa