If you have the type of dog who will fetch a ball or frisbee and actually bring it back to you, then the HurriK9 might be for you. No more worn out shoulder from having to throw the ball over-and-over. For $39 you can get in line to get a frisbee disk launching gadget, the HurriK9.
The HurriK9 can launch the ring shaped frisbee 120-feet with ease. They are also building an XL version that can launch rings up to 100-yards. Head over to Kickstarter to check it out.