A friend of me had similar thing with her dog, a cocker spaniel! She, her hubby, and her daughter are all gone all day until 3.30 pm. Toby (that dog) chew on ANYTHING he could find in the room: blanket, boxes, furniture, even the doorposts! As they rent the house, she didn't like it that Toby ruined so much! Then they bought a huge metal crate, and trained him to stay in there during the day. No more problems now !!