The importance of being vigilant

The worst thing in the world is the mailman. You should see him, he's really scary. My sister and I have to protect our people and our house from him. He sneaks up on the porch, wearing some kind of military uniform. I think sometimes he wants to steal our food, or even put a bomb or anthrax in our mailbox. But we scare him good! We bark so loud it makes him jump. We sound much bigger than we are. My sister sounds like a Rottweiler. I sound like a Doberman.
We're a good team.