Betty as dog
Betty Boop was originally planned to be a sort of "Minnie Mouse" to Bimbo's Mickey. But within a short time she developed as a human character.
I once read an article, can't remember when or where, that claimed a Jewish sub-text to the idea of initiation, the Fleischers as Jewish outsiders, in a period when it was difficult to feel otherwise, looking at the initiation from that point of view. A Jewish sub-text can also be read into their "Superman", which I'll discuss on that page.