It's simple, just ask them what started them down the path to becoming a furry.

If they got into the fandom via anime, then they probably prefer 1 or rarely 2 (from shows like Beastars or Brand New Animal).

If they got into it via Disney, 3 or 4.

If they bring up Pokémon, back away slowly.

That sounds more like an archiveofourown.org plot, personally.

No, wait! It'll go right to your thighs!

... On second thought, carry on.