My CSW has allays been outside.
Last winter was few days with -21 and there was not any kind of problems.
Now together with Karlos (my CSW) also outside I have a Malinois 7 months old.
They sleep separately but during the day they are together and playing all the day ...
So ... my opinion is the the dog is exactly like you grow it ... That doesn't mean that a very small puppy can be left outside in a very cold weather.
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