A childhood belief about cats and dogs

Until I was 10 (Im 12 now), I used to believe all dogs were female and all cats were male (It's the other way around, strange isnt it?). I even drew a picture of a female dog showing her mate (a cat) that she had his children, and her children were not mixed, the boy babies were kittens and the girl babies were puppies. And also, in that picture, the parents and the babies had there own blankets (The mother dog's blanket was red, the father cat's blanket was blue, the puppies had pink blankets, the kittens had blue blankets.) And the babies were in what appeared to be a dog or cat bed. I also drew a picture of a female dog and a male cat getting married. My sister, on the other hand used to believe all dogs were boys and all cats were girls thanks to some cartoons. She even drew a picture of a dog, a cat, and their babies just like mine. Except the cat was the mother.