I'm glad you're dog has become used to it oldie. The thing is that with some dogs, for a variety of reasons (old, thin, short-haired, small etc), we have to put a coat on them in cold weather. After all, they're not living in the wild, becoming inured to extreme temperatures - instead we pamper them with centrally heated houses and warm cosy beds. Of course they're going to feel the cold much more when we take them out. Thankfully my DD's dog is a big, well-covered black lab and can tolerate the cold fairly well.