I actually voted no, because Castor doesn't know whether he likes it or not... We've never played tug of war with him as I don't want him to even consider trying to pull something from me. He doesn't always drop things on command, but I can always open his mouth and take the ball or toy, etc. without problems, and I've always thought that if we would engage in tug of war play he would not let us take things from him so easily.
My Hubby and I don't play it with Baz, but the kids love to and he loves it, we tried to discourage with the kids as Baz thinks he is on level or the boss of them.