Every time there's one of those dog attacks--you know the kind...pit bull mix raised by neo-nazis mauls cute 90 lb. brunette when it breaks out of its owner's apartment while the brunette is coming home from the fitness center--all of the dog people are like, "Ohh, it's such a pity the dog wasn't well trained," and then, "The brunette should have used 'calm/assertive' behavior to signal to the dog that she was an alpha dog, because when she turned and ran, she triggered its 'chase' response."
What happens when all those brunettes do try to be calm/assertive in the face of the charging dog? Presumably, all of the pro dog trainers start warning us to avoid eye contact, to avoid appearing threatening, to be "assertive, but not aggressive," and so forth. There'd really be no way to please them, because how do you tell whether someone was merely "assertive" rather than aggressive, unless you have not only video feeds of the entire attack, but also EKG and EEG results from prior to the attack, along with testimony from experts on canine/human facial interactivity? And even then, the experts would disagree with each other. So I'm afraid the only thing we can do is to just turn it over to the pit bulls right now.