A watchdog.
A man wears a suit and the dog, pants.
The tomato is red.
Namaste (pronounced:nah I'ma stay)
Because if they are they'll tell you, and if they aren't you don't want to insult them.
I don't know,Alaska guy and tell you
Staying up all night wondering if there really is a dog.
A terrified postman.
Because he's the watchdog and he has to wind himself up.