In my opinion, gods can be whatever we make them to be, so you can call them furry. I’m more of the opinion that you have to dress up as a animal to be a furry
Barney came out in 91 of course there are a lot more anthro characters before that but if your taking costume mickey would appear as a costume in 70s Disney world commercials and I wouldn't be surprised if there was stuff before that
The joke is that femboys (they wear socks) socks are so thick that not even a snake (the ones biting me in this hypothetical) are not able to reach the skin