Hello, we have a sweet beautiful 4 month old Berner puppy. This is our first dog ever and she is very sweet. My question: our trainer says the next step in training is going to be a prong collar and E-collar to train and introduce negative consequences to undesirable behavior. I have met other Berner owners and golden owner who've gone this route. Is this the only way for training? Is this necessary especially for a large breed? I'm on the fence. Obviously I want a well mannered dog that can live peaceably in our home and be polite in the community. But wondering if we don't go this route how to teach negative consequences and reinforce "no".