In other words, he rewarded the dog’s good behavior while ignoring the dog’s bad behavior.
Surprise, surprise, the dog’s bad behavior—not corrected-—becomes worse.
Dogs are pack animals. They need to know that their pack leader (their human owner) is capable of leading the pack and in control of the situation. If not, then the dog will challenge the apparent leader (largest and strongest in the pack) to claim dominion of the pack.
That is not what I said, not at all. He did not use the Michael Vick negative reinforcement methods. Perhaps it is a difference in definitions. I view negative reinforcement as manhandling the animal to the point that they are cowed when you walk in the room.
I knew one woman trainer that used a clicker to distract a dog when it did something negative. The dog would come to her to investigate the noise and she would reward it. To me that is positive reinforcement.