My boarder collie/husky mixes would probably pee and hide if I growled at them. A lot if "experts" that spend a lot if time discussing ALPHA roles are buying in to pseudo science. Dogs are not wolves they have been breed over hundreds of years to interact with humans differently( and wolves don't function exactly like how they say either). Yes some dogs are more inclined to be the boss-and they need to Trust and Respect their owner to accept them as the boss. We had a wolf-dog. We were told he needs to know it is a good thing you are in charge. Being the source of his food, caring for and loving him, teaching him to follow our commands. He was a very good, obedient, boy and never aggressive with us. Not all dogs are easy, but this seems like the old bite the baby to teach it not to bite. And if I was a dog and all of sudden my owner started growling at me I would think he lost it, lol, and it would certainly affect my trust.