I see someone anonomously has already put my belief up, the one about cats being female and dogs being male but I also didn't know the truth until I was about 9 yrs. old when my mom told us about the birds and bees. Then I got the idea how things actually work. I am glad to see I am not the only kid who thought that.
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