When humans do not have knowledge about dog psychology, we witness the behavior of our dogs and rationalize their behavior based on human psychology. That's where most people get confused and create stories in their mind about why their dog behaves the way it does. In this situation, we're talking about a nervous dog who didn't get exposure to dogs, humans have left leadership position vacant, and now reacts on leash when they see another dog to keep that dog away from themselves and their owner