Poor little boy. Toby was passed around too, and this has made him quite insecure but even after two months things are improving
We had a border collie with severe seperation anxiety, she was a rescue dog and it was very hard to cope with, in the end we just took her everywhere and if there was no way around it we had to leave her in the kitchen but we had to move everything because she even dragged the microwave and kettle etc down on occasions, which apart from anything could easily have harmed her.
We had no help though, we didn't know about behaviourists etc at the time. With support from the RSPCA I'm sure someone could help this boy with his problems, especially as he is so young