You've gotten some really great advice here. I just wanted to say that letting him have full run of the house at all times can cause/reinforce dominance. He will start to think he is above you in the pack in no time, and this is not the route you want. Having to go back to square one with a dog who thinks you're below him isn't easy Crate training is essential, and like everyone else said just train him as if he were a puppy since you don't know if he was ever trained before. I am crate training Luka at the moment. When she first got here you literally had to pick her up and shove her into the crate, not easy with a dog her size. But I *couldn't* let her have the run of the house because I didn't know if she would chew stuff up. So I started throwing a treat in there to get her in and give her lots and lots of little training treats and lots of praise right after I put her in. She's learning to love the crate, and for the most part she is walking in by herself now, and I've only had her two weeks.

Good luck!!