try using 2 balls. always keep one out of his sight, such as in your back pocket. When he brings the ball 2 you, then take that ball out and motion it so he can see it. hopefully he will drop the ball in his mouth and wait for the throw again. My dog has problems with bringing the ball back, she takes it to different places and drops it and then comes to me. So I play fetch with 2 frisbees, 2 balls, and some times 2 other toys. I just walk to where she stacks up the toys and then start all over again. I think she doesnt like that I stay stationary and she has to run, I dont mind she always leaves the toys within 50 feet so its not like im walking allover and forever. Her motions are funn sometimes, I think she is trying to throw the ball back to me. she has the ball in her mouth and she starts to jump in an odd manner like if she would realse the ball it would be thrown. shes frkin funny