How old is SammyJ? Sometimes treats don't work as rewards. Sometimes they prefer praise. Also maybe there is a different type of play you can try. Some dogs just won't fetch. Maybe if it is possible you and a friend of relative could spend some time playing with him by sitting on the floor and rolling the ball back and forth or standing and bouncing the ball back and forth between you. Maybe the interaction will stimulate him and make him want to play too. I am sure others will have other ideas for you. Good luck and keep us posted.

Michelle & the girls