No dog should be left out in the cold (or heat) regardless of it being a pit bull or not. How would you like sitting out in the cold (or heat) all day, not being able to go inside? You wouldn’t…neither would a dog. You said that you have a crate for him? Why not use that? Keep him crated while you’re not home if yor’re worried about him getting in to anything. I have 2 dogs and they are crated when we are not home and they’re fine. Warm and happy.