If you don't like when dogs come to greet you, being a mailman isn't the job for you. Historically, mailmen and dogs have always been nemesis. It's a dog's job to protect their humans from all number of potential threats, like delivery trucks , pizza delivery people, neighbors, children, and people taking walks. To a dog, if you walk by their home, you're automatically going to get barked at for a while. That pup's got to alert everyone in the home that someone's out there! Look! Then, their hu…