I live in Upper Michigan, it get's cold and snowy here. My new Pup, HazelNut, she's 5 months old and almost 5 pounds, she goes right out in the snow, plays and is just fine. I only leave her out for maybe 10 minutes or so, and I've taken her for walks if it's above 25 degrees. It just dosn't bother her/ my last pup, she was a bit smaller and would shiver if it was below 75, inside or out.