Thankfully because it was before their time or online activism. Also it wouldn't really count for them as being tranny since the sexes of the dog/cat species are naturally the reverse of humans, that is if they had gone with the original script. But even then it was mostly played as a joke/unexpected surprise, but if they did it today you can bet they'd find some way to make it mega woke and Twitter types would go insane over it rather than the story as a whole (I mean tumblr is an insignificant speck compared to the obnoxiousness of Twitter lately).