not_furry_focus should only be tagged applies when there's something 'furry' in the post: anthro, feral, (animal) taur, or animal_humanoid.

Note that posts cannot be tagged as both not_furry and not_furry_focus.

Use ambiguous_form if you can't tell whether the out-of-focusr character is furry or not (usually because there's too little of them visible.)