My roommate has a dog that he "saved" from an old family that had a farm. It was an outside dog.. It's been getting cold out, like 15-20 degrees, and my roommate keeps the dog outside.. We don't have any where inside to keep her, but I'm curious.. The dog seems ok in the cold, she has a well insulated dog house surrounded with lots of hay/straw.. How cold is too cold for a dog? She's some kind of lab mix.
