In the last few months, whenever I go out, my dog (4year old) has started to open cupboards and eat whatever he can find. Mostly food, cardboard boxes, raw veg etc. today, I moved him into another room only to find he has ripped open a pencil case, and eaten pencils and other bits and bobs. This is becoming a serious problem, and am On the verge of crating him as I don't know what has started this or why he is doing this. Any help,or advice would be appreciated. He has been on steroids for about 6 weeks, and wonder whether this is having an effect on his appetite or is this destructive behaviour something else. Many thanks