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Hey Joseph,
as Daria mentions, using a long lead to teach fetch or tug of war is pretty muc always necessary. What you want to keep in mind is that you have to keep control of the toy and of the game, but also you have to be the most interesting part of the game. At first your dog may not be very interested in the toy or may not want to play with you, use jerky motions, changing speed with a toy on a rope for example. Let the dog win but show him that playing with you is going to be so much more fun than taking the toy away and chewing on it.
It is also a good idea to have food as a trade off when you are done playing, that way you get to keep the toy but he does not see it as a loss.
