I have a ball obsessed spaniel. I have long thought that some kind of automatic machine, like you have for tennis practice, would be bloody marvellous. I've been investigating today, and they do make such devices but they are ££££. Has anyone managed to adapt something to fulfill this niche? I can't spend hundreds, but I really would like to get Jasper flinging his own balls as it were. My arm hurts :( I was thinking that I could train him to fetch the ball, drop it in to the device,a nd then it would fire it down the garden. Voila. One happy, knackered dog, and one happy owner who can watch him from the warmth of the house and eat biscuits