Having rescued a Bouvier, who was about 2 and was supposed to euthanized for his "aggressive" behaviour, I have some experience with the Breed.
My Father always claimed I named my older son after him, which I did not, but his name was Ben. To me, he was Gentle Ben, like the Bear. He came from a very abusive environment, where they tried to "attack train" him a la 80's style. Little human contact, hurting and hitting him to make him fight back...horrible.
I really was too young for him, and inexperienced but we managed for a while. I agree totally with everything Kian said about how to stop this behaviour now. In my opinion, Bouvier's need to be constantly reminded who is actually in charge, as they really are so sweet, and very, very protective of their humans.
It is essential to really work with a Bouvier, socializing as well as training through the "teen" years, which is about 2 years of age for a dog. I can assure you that all the time I had Ben, I never had to lock the door.
Unfortunately, he was not healthy and I did not have him for nearly long enough.
Many dogs enjoy playful mouthing, and I think of Goldens when I say this, but mouthing as a demonstration of displeasure has to be stopped. It is imperative that the "others" in your household, and in his life, understand that consistency is absolutely key. Dumb it down so they understand cause and effect.
You've also posted a very good question as most of these threads are geared to the initial raising of a puppy, as opposed to rehabilitation, or correction a bit later in life.
Keep us posted please. We would love to see pictures.