A behaviorist can teach your Puppy to not overreact to stimuli and never to lunge at, attack, or bite the objects that it fears. There are distinct approaches for example BAT, or behavior adjustment training, that is the method I'm training my Doggy now with the assistance of a http://changingbehavior25813.mybjjblog.com/the-training-dog-aggression-diaries-10291100