I'm not sure how or why I came to believe this, but when I was young I was convinced that all cats were female and all dogs were male. Imagine my surprise when my grandfather's dog had puppies! I guess I figured that cats and dogs mated together, and the cats were the ones to birth both kittens and puppies!
A childhood belief about cats and dogs

you weren't the only one
215 of you believed this
- I used to believe that cats were all female and dogs were all male.— Rachel
- that cats were only girls and dogs were only boys. I definetly didn't get the whole reproducing thing yet.— Jamie
- i used to believe a dog was the male version of a cat.Anon
- I believed that all cats were female and all dogs were male. — Biologically confused
- i thought cats were girls and dogs were boys. Anon
- i used to believe that all cats were female and dogs were male!Anon