my dog is nearly 3, he is a rescue dog and is a mix (we think) of rhodesian ridgeback and mastiff. When we are in the house he is perfect however when we leave him we give him run or the conservator kitchen, hall, stairs and landing ONLY. Recently he has been chewing plastic and anythign he can get hold of ! he had dragged our bin through our kitchen but its only happened recently within the past 4-5 weeks. We have tried everything ! and would much appriciate any tips or advice. Many thanks.