On cold days Cassi doesn't even want to go out. She'll just stand by the door and after much encouraging she'll finally come out. But once she's out instead of doing her business, she'll just stand there and not move. At that point, both of us are cold and I end up carrying her right back in. Now, I don't even bother taking her out on cold days. She gets plenty of exercise at home when I play fetch with her.