In this application, Abby asks the user what she should command her dog to do (Options are fetch, jump, and sit). The user types an option. 1. Add broadcast and receipt of messages so that the dog actually obeys Abby. 2. Can you figure out a way using messages so that the ball disappears when the dog picks it up, and reappears at Abby's feet when the dog returns it? 3. Can you add additional logic to expand the things that the dog can do?
