Until about a minute ago I thought the phrase, "It's a dog eat dog world." Was actually, "It's a doggy dog world." I feel so ashamed. I usually never misunderstand idioms.
A childhood belief about speaking

others believed things like this
- Until a few years ago, I believed this was a "doggy dog" world, rather than a "dog-eat-dog" world.— jemima
- I used to think that the phrase "It's a dog eat dog world'' was its a dogey dog world.— Gabral
- I used to think that you could feel the world spinning.Anon
- I thought the world was black and white because of all the smoke from the bombs in Second World War.— Bjoern
- I used to believe that we lived inside of the world. I asked my Dad who lived on the outside of the world. — Pauline
- I used to think a world record was a record of all the people in the world singing .— JACK REGAN . [SWEENEY . ]