I really believe the dog will be fine in those conditions. Having a dry place out of the wind and protected from direct contact with the ground is pretty luxurious for most 'working' dogs. A manger full of hay in a barn is pretty good, too.
Years ago, we had a short haired hunting dog which I worried about a bit. She preferred to be outside most of the time, but was inside sometimes in the worst weather. It gets pretty cold here. a minus 25% is not unusual. Wind at 10% can be pretty brutal, too.
Point is, if the dog seems reasonably comfortable, is well fed, and has water that is not frozen, it should be fine. But it may whine and cry to gain your indoor companionship rather than because it is uncomfortable in it's own 'home'.
mrj