I don't have a reply, but this brought to mind, a fragment of something from when I was a kid, I don't know if it was something from kid's books,or some stereotyping of cats and dogs, I don't even remember if it had to do with the behaviours of females and males being symbolic,represented by the 2 animals or what? But I think the thing was (which I do not like at all) that the girls were like cats were smart,(cunning),moved more graceful and quick, while boys like what some pathetic people view dogs as.
I never cared for such symbolism(sp?).
I wonder where this ever came from and why it would have been around in our schools.

Maybe it came from, the scientific fact that females mature before boys of that same age?
Good question, James.