Less furry and more just horny as fuck. It'd be simpler to think that it was easier to get lewd imagery broadcasted if they were animal ladies and not regular ones. "It's not indecent if it's an animal, no one would want to fuck that!" Cue the loud sweating and nervous laughter.

That said, I'm sure some of them were genuine furry. I remember once seeing a clip of some animator talking about how he wanted to fuck Bugs Bunny, so it's more likely than not. Be interesting to see the exact numbers though.

I mean, they did not stop at sheep.

Pretty sure that the cartoon industry has been dominated by furries since its inception and only recently do we notice.