Folks on this board may view me as a stick in the mud but i am a firm believer that my newf is part of my family and therefor will act in a way that is acceptable to the family.
Nipping is NOT acceptable ever.. not in play and certainly not in a stubborn moment. Tearing of paper is not acceptable either be it the newspaper, toilet paper or any other form of shredding. Nobody said having a giant breed is a walk in the park, it's not easy when a dog can outweigh u.
Just as with children one must socialize and teach.. it's a long process and it never ends. If your child goes to nursery school and bites (or nips) other children you can be sure your child will not last long in the school.
So what to do ? Good advice has been given. Training takes work, it is constant, and for good reason. U want your dog to know what is acceptable to the pack and what is not. U want good manners to be habit.. and yes dogs are creatures of habit. Everything you do should imprint on your dog... example if he views your leaving as a time to lie flat.. well u must change that. We put a few spoon-fulls of peanut butter into a Kong and freeze it.. Kelvinn could care less if we leave.. he's got his Kong now... it's really all he cares about at that moment.. yummy!
We have him sit before his collar goes on for walks.. we have him sit when he comes home so we can remove the collar, this has become habit so we never need to say a command. We do not allow our dog where we eat, the table is set and Kelvinn knows time to leave the room.. again.. Habit. We always eat first, he gets fed after we are done.. habit. We do not allow Kelvinn to be the first at the door when greeting ppl.. we didn't think this was a problem until the pizza delivery guy dropped our pizza and almost has a stroke when Kelvinn was first at the door, now he must wait down the hall in a sit for everyone coming to the door.. he is not allowed to greet until the person greets him.. children are an automatic down.. again habit.
All this did not take overnight.. we worked our butts off reinforcing good manners and it has paid off. Working for good habits pays dividends in your life and your dog is happy when he knows the rules, the stress of having a giant breed is at 0 level in our house.. Kelvinn got Habit