Our dog is about 18 months old. He's a sweet little guy, really well behaved, etc. H and I used crate training with him until about 2.5 months ago, and then, since I started working, we decided to see how he would do being confined to a room and having more space because we felt bad crating him for more than 5 hours. We started slow, leaving him with the bigger space for a few hours at a time, until we worked up to him being able to be alone with no issues for up to 8 hours. Up until a few days ago, he's been fine being left alone, wasn't being destructive or anything. Since wednesday however, not only has he been escaping his room (chewed a bar off the wooden gate) (we live with H's parents while we are house hunting and they will find him elsewhere in the house during the day), but he's also been getting finding things to tear up and shred. Before I leave for work, he gets at least a 1 mile walk, then we usually throw his tennis ball outside for at least 15 minutes, plus he gets lots of attention/family time when we are home. I give him a frozen peanut butter kong and a couple treats and other toys in his confined space too. Could he just be entering his "teenage" phase? He doesn't display any other signs of separation anxiety, so I don't think it's that. H wants to start leaving him in an empty bedroom, but I have visions of him scratching up the door, which is a heck of a lot worse than the cardboard boxes he's been finding so shred. Any ideas/thoughts/suggestions would be appreciated!