When I was little we had a dog and a cat. I thought dogs were boys and cats were girls so I thought that dogs and cats got married. I didn't think that 2 dogs could marry without being gay and 2 cats would be lesbians. I was later told that both of our pets were female and I was disappointed as that would mean they couldn't have baby kittens/dogs.
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