Most of my dogs diet is raw rabbit, I never cook it, not because I cant be arsed, but because it is much better for the dogs to digest than cooked, plus they get the bones etc, which, if cooked are a deffinate no no!
I must say that I never used to freeze all of the rabbits I fed to the dogs, and they did get wormy quite regular, and I was worming every month or two. But now I always freeze all of my catch, and it has deffinately made a big difference with the worms.