The categories below have some overlap. Some videos are directed towards professionals other than emergency healthcare providers, but the principles in them will still be of value.
Confidence-inspiring videos that show techniques for handling aggressive dogs are rare. The one linked to below has a few pink flags (such as the all-caps "GUARANTEED!" in its title,) but I feel it is respectable enough to share.
"Fencing" is a moderate response to an aggressive person who gets within an arm's length of you. The video link below shows how it is applied by a professional bodyguard.
An old Jewish platitude states that a clever man can talk his way out of trouble; a wise man knows how to avoid trouble. The reality of emergency response is that we must be both clever and wise.
It has been said that casinos make money because casinos do math and gamblers gamble.