This coat warms up my dog's body, especially his fragile back hips, and works really well at keeping him from getting sore while exercising. I'm very pleased with it. Unfortunately, I've tried two different sizes, and still can't get the fit right. The coat slides down his neck and chest and then hangs too far over his butt, so he can't poop without me running in to adjust things. Even around the house, he seems a little uncomfortable in the coat, tending not to sit in his bed or lay on his side while wearing it. I wish there were a way to keep it in place better.