You may have seen this video, but it’s pretty fun to watch a small dog use a home-designed ball thrower to play fetch with himself. We love this kind of engineering ingenuity.
Dog “fetch machines” are commercially available, too. See the iFetch machine and the Go Dog Go Fetch ball launcher as two auto-throw options.
The iFetch auto-thrower for dogs was funded on Kickstarter and is now for sale at $99 here
