In addition to spending quality time with Piggy, help keep him entertained by giving him objects to play on. Try adding one or more of the following to his cage:running wheels, escape tunnels (PVC pipe-wide enough so that Piggy can't get stuck in it, of course-makes a good tunnel), ladders or plywood boxes (to climb on). On mild days, you can supervise him in a safe, outdoor pen (with shade always available), and you can make an indoor playpen, as well, to provide him with more room to roam. Your friend would also enjoy exploring a closed room now and then, under your watchful eyes, of course.