My 2 year old Miniature Pinscher barks at every sound he hears. When someone comes down the steps he starts barking, he seeing some walking down the street he barks, if my mother coughs he barks, if he hears any noise even if he has heard it before he barks. He barks at people and sounds. I dont know how to stop this behavior. I have tried distracting him in the moment, he has a bark collar on which used to help somewhat but now not anymore.