If you are a 90's baby I am sure you remember Courage the Cowardly Dog. A little pink dog who was always a nervous wreck, and had elderly owners. In this cartoon Courage is always afraid because he 1) lives in the middle of no where and 2) is always seeing "monsters". Now in the show he sees the monsters and is trying to protect his owners. Now the theory goes that Courage is actually just normal dog and when he sees the "Monsters" they are actually a just regular people. Since Courage's owners are elderly they don't get to take him out much so the outside world is scary to him. So anyone new to his is scary since he doesn't know about the outside world.
