I've just adopted Stella, a small Boston terrier who lost her back leg and broke a front leg in June. She is such a freeze baby, I always have her in sweaters and jackets. That isn't helping when she goes out to go potty in the cold Ohio rain and soon snow- she shivers and wobbles so much she keeps falling over. She won't go on the pee pads I've offered her as an alternative inside. Any advice?