All mine are in a pen with a ply dog kennel raised off the floor and sheltered from the wind to sleep in. I don't use any bedding as they shred anything within minutes, they just sleep on the ply floor and grow a thicker coat in the winter as and when required, Its surprising just how quickly the coat thickens up once we have had a few cold days at the start of autumn.
In my experience, if you keep a working dog in the house where its constantly warm their coat hair length doesn't grow long enough for long days out in the cold in remote areas of Scotland. There is nothing worse than a wimpy dog shivering in the snow and not wanting to work - Dogs kept outside in a kennel and fed on deer carcasses are much keener and hardier IMO.