I think that if you feel that your dog needs a jacket get him/her one. I used to do the same thing with one pit I had. But he was shivering I was just overprotective. Plus it makes people feel more comfortable coming up to a pit for some reason. The only con I see to you getting it a jacket is that you live up north where it gets really cold the dog will need to get used to the weather where as I live in the south. Really you know whats best for your dog.