Fetch

If your dog doesn't fetch naturally, have an adult cut a slit in a tennis ball (a smaller, rubber ball if that is too big). Put some treats inside the tennis ball. Show your dog that there are treats in there, and give her one. Then, throw the ball. In the beginning, run with her and get the ball; then give her the treat. Soon you will be able to throw the ball and she will go get it (because she wants the treat!).
TIP:
After your dog has figured out what he has to do to get a treat, start throwing the ball two times in a row without giving him the treat. What you are trying to do is give him the treats less and less often so someday he won't need the treats in the ball to fetch it.

From~ http://www.loveyourdog.com