I would love some advice! My fiance and I adopted a lab/boxer/pit mix at about 9-10 months old. We've had him about 6 months now and he is overall excellent on the leash, with people, and other dogs. When we are in the house (with my fiance home) he will chew his toys and be well mannered. The second my fiance leaves, he goes on a terrorizing spree and chews everything and anything he can find in the house (remote controls, couch cushions, toilet paper, shoes). If I have some household chore to perform, I try keeping him with kongs filled with treats (last only 20 minutes, even frozen peanut butter!). It has gotten so bad I have to remove everything from his level, including toilet paper from the bathrooms. I have tried bitter lemon spray, reprimanding with water bottle spray, positive reinforcement with treats for chewing his own toys, and it seems to only be getting worse. Is this anxiety from my fiance leaving? Is he trying to be alpha? He will do this for about 90 minutes until he exhausts himself. Sometimes putting him in his crate calms him down but I have read not use the crate as a form of punishment. How do I fix this? Help!