A dog bed and a blanket - just in case - is all you should need.
I live in the 4th coldest capital (remember that thread ha ha!) and Kyleigh as been fine in -35 weather. (Me, not so much ... ) Mind you we are walking / running ... moving. But even on nice days at only -15 there are plenty of times that she just likes to sit in the snow in the backyard and "be." I check on her regularly ... and all she has to do it bark once, and she comes back in. She can be out there for a good hour or two and she's perfectly fine.
Marion’s Zoo-Kyleigh, Raylan-cat, Echo-TAG,