How to make sure my indoor dog stays warm in winter?

Update: She sleeps with me at night and is in her crate indoors when I'm not home. The temperature is supposed to get 11 degrees tomorrow night. She is 6 months old. How do I make sure she is not getting to cold? She is outside for a couple hours a day when I'm home but I have been limiting her time outdoors since... show more She sleeps with me at night and is in her crate indoors when I'm not home. The temperature is supposed to get 11 degrees tomorrow night. She is 6 months old. How do I make sure she is not getting to cold? She is outside for a couple hours a day when I'm home but I have been limiting her time outdoors since it has been so cold.
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