Remember: Never run from a dog. You must use your intellect to overcome your instinctual urge to flee. More than 90 percent of the times dogs exhibit aggressive behavior, it is a reaction based on fear. Your goal is to eliminate a perceived threat or remove an opportunity to attack. If you run, there is a high probability that the dog will chase and attack you. If you stand still, he will most likely sniff you, and go on his way.