I don’t know why I believed this, but it is breathtakingly stupid. I used to believe all dogs were male and all cats female. I was pretty young when I believed this.

Maybe it’s understandable, because all the cats my family ever had were female. This was because my mother believed all male cats sprayed urine. They do, if they are not neutered young, but my mother wasn’t taking any chances. So I had never had a male cat till a few years ago.
I remember exactly when I was disabused of this notion. I was in the car with my parents and sister, and my mother laughed at me when I told her this. I don’t blame her — my belief fell into the category of ‘strange things little kids believe’, and it is funny.