Some brands of tennis ball machines for dogs include Hyper, GoDogGo and iFetch. The Hyper dog ball launcher shoots balls up to 220 feet and comes with four tennis balls. It does not does not require assembly.
The Hyper launcher received a four-star rating from 82 customer reviews on Amazon.com, as of October 2015.
GoDogGo's fetch machine is battery-powered with three time and distance settings. It features both independent fetch and owner-controlled play using a remote. This machine has an on-demand launcher with a sensor and safety switch. An automatic stop mechanism keeps the machine from running unless the ball is returned to the bucket to begin a launch.
The iFetch dog ball machine is designed for smaller dogs and for both indoor and outdoor use. It has three launch distances, 10, 20 and 30 feet, and comes with three tennis balls. IFetch is battery-operated.