Raider's ball game that never ends

Raider loves tennis balls! We often have to take away the ball in the house, though, because he wants to play non stop. When we don't throw it for him, he tosses it for himself and it ends up under the couch, the night stand, the bed, or other places where he can't retrieve it. He tries to dig it out if we don't get it immediately. If we are sitting trying to relax and watch a little TV, he tosses the ball to us so we will throw it for him. If we don't toss it, he gets the ball and gives it to us again. This will happen over and over and over again until you either hide the ball (or take it away) or you give in and toss or drop the ball. He would do this for hours...