They actually made a law here that prohibits dogs from being kept in extreme weather(hot or cold) I'm more of a rebel and I would sneak the dog in at night and look for a doggie day care during the day to protect him. mine go out in that weather and are done within a couple minutes. I've watched my older dog, that is a major furball(will stay outside comfortably in 20 -30 degree weather for long periods--I have to bribe her to come in) collapse due to the cold. I've had to run in the yard barefoot and carry her in.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD