"I’m often asked, “How do I protect myself from a strange dog that starts acting aggressive or charges towards me?” For most people, this is a very scary scenario, but there are tools you can use to try to diffuse the situation.
If this happens to you, stand still, remain calm and assertive, and do not make eye contact. Remember, when we are clear and focused, animals will mirror our energy. In other words, if I move, so will the dog. If I stop, so will she. Relax, and don’t move until the dog walks away.
You can also use physical tools to guard yourself against a potential dog attack. Try carrying a walking stick, tennis racket, or umbrella. These should NOT be used to hit the dog, but props you can use to claim your space!
Again, if the dog is coming towards you, stop where you are, stay calm and assertive, do not make eye contact, and have your prop in front of you. When the dog realizes you mean no harm, she will back off and you can move forward." Source:https://www.cesarsway.com/cesar-millan/cesar-tv/dog-whisperer/season-three-episode-guide
I love Cesar, I'm buying the audiobook version of his books so I can listen to them in my car!