Why do dogs approach me?

Dogs were found to prioritize the scent of humans over other scents. Typically when a dog sniffs a person they are uncomfortable with, it’s due to the pheromones that person is giving off. To the dog, those pheromones may signal a threat or an alarm telling the dog to beware.

What to do if a dog is aggressive towards you?

Stay calm, and back away slowly. Instead of screaming, or yelling at the dog, speak to him in a soothing tone as you slowly back away. Don’t make direct eye contact. Staring in the eyes of an aggressive dog may prompt him to attack.