A few months ago I adopted a 9 month old border collie/lab mix who has endless energy.  Fortunately she loves to play fetch so we can TRY to wear her out with this activity.  The problem was that within a few weeks of adopting her, my throwing arm ached like crazy.  I didn't know launchers even existed when I turned to the internet to solve my problem, but my husband is an engineer so I decided if I couldn't find something, I would ask him to design one.  Well, it didn't take long to find the Chuck-It and I ordered two of them - the long one and the mini.