I used to believe that dogs were male and cats were female, rabbits were male and squirrels were female, snakes were maaale and spiders were female, etc. I had all the animals paired up is similar fashion -- horses & cows, frogs & toads, etc.
A childhood belief about general

others believed things like this
- When I was little I thought cows married horses, cows were all female and horses were all male. — Sheila
- I used to believe all cats were female and all dogs were male.— Sabby
- I used to think that all cats were female and all dogs were male. — Annalisa
- i used to believe that all cats were female and dogs were male!Anon
- I used to believe that cats were all female and dogs were all male.— Rachel
- i used to believe that all cats were female and all dogs were male— am i weird?