My 9 year old Jack Russell terrior has been acting very differently lately. For years I have left him in my bedroom while I go to work at night. I work from 7pm to 7am 3-4 nights a week. I have never crated him or felt the need to. the only hting he has ever done is bring my shoes (sometimes many pairs) up onto the bed and lay on the. On a few occasions he has chewed the strap of a pair of sandals or one of my wife's bags in half. This has been annoying and expensive of course, but now very suddenly he has become much more distructive. I am worried to leave him alone even for a few hours. I even unplug all electrical cords in the room for fear he might chew through one. He will dig in the trash climb on anything he can, pull things off high shelves and last night he even turned ove a 5 fool high rolling shelf....a small Jack Russell Terrior mind you. I have always known that he reacts badly to thunder storms if alone, but he has never done anything like this. We came home from a cookout a few nights ago and he had pulled all of the towels and linens out of the closet. We were going out afterwards to listen to a friends band and we had to take him with us and leave him in the car. He was good in the car with us inside the lounge however. This is very puzzeling. We did insulate the walls of our house with blown-in insulation recently. I wonder if that has made him sense something different and is driving him crazy. He acts fine when we are home with him though.