My suggestion would be to let the owner train the dog. He knows the dog, the dog's temperment, habits, etc. and he should know what commands he wants to teach the dog. Plus, you should not even try to train him if you don't know what your doing. Too many things can go wrong, especially with introduction tothe gun. I have seen too many promising dogs ruined by owners who thought, "this might be a good idea."

Tell your friend to get a good retriever book or check one out at the library.