You're right about the "state your business!" bark. My dogs telegraph a lot with their barks. I can tell if they're excited about animals at the back, I can tell in an exciting animal is in the yard (that isn't pretty), and I can tell if they are challenging a human. Poppy was doing that bark a couple of weeks ago and I went into the back yard to stand beside her as she telegraphed a bark to the man on the next door neighbor's room "What Are You Doing UP There?!!" The bark really does change. I knew I'd be seeing a person when I went outside.