No one. Jerry's last prank on Tom is to put a screw into Spike's bone and then trick Tom into swallowing a magnet, which causes the bone to follow Tom wherever he goes. An angry Spike believes Tom is trying to steal it. It seems Jerry has won, but he makes the mistake of hiding in a tin can. The can is attracted by the magnet. In the last shot, Tom is running down the street, followed by the bone, which is followed by Spike, who is followed by a helpless Jerry.