Mandy went through the I'm not bringing the ball back phase, it didn't last long because when she would not bring it back (after I asked her too) I just said, game over and walked away. A few minutes later I would get the ball throw it and try again, if she brought it back loads of praise and treats if she didn't game over again. It didn't take long for her to figure out which was better. Now we dont' even need treats anymore playing with the ball is better than treats. :)
