My St. Bernard would stare at me all of the time if I wasn't paying enough attention to her. I eventually came to the conclusion that she was an alien, studying my habits so that she could tell her other alien friends when they came to visit her.
A childhood belief about cats and dogs

others believed things like this
- I thought the ball-headed person in the Bic logo was an alien and communicated using alien-like noises.Anon
- Oh oh, I'm an alien, I'm a little alien...
Legal maybe?— Marina - I used to think that my cat was an alien that had come to teach me how to be good!— laz
- I used to belive that my teacher was a alien unfortunately this was true mum and said. — peter
- I used to think that green poop ment you were an alien.— fartcheeks
- When I was little I used to believe that God looked like the Great Gazoo (the alien from "The Flintstones").— Susan