As it currently stands, furrification applies only to things/characters with no animal traits in their original form, which get portrayed as anthros in the artwork. This of course excludes things like animal_humanoid -> anthro, which has been explicitly stated in the wiki. This leaves such depictions without a suitable tag to belong under.
There's alternate_species, but that doesn't feel particularly adequate, since most other situations are covered (feralized includes anything non feral depicted as feral, same for taurification, humanized, and humanoidized). This trend breaks when it comes to anthros, splitting into anthrofied and furrification, which both combined don't cover things like animal_humanoid -> anthro (mentioned earlier).
Should furrification be expanded to include animal_humanoids and others similar to it? If not, should there be another tag that encompasses it, or are we fine with the status quo.
Tangentially related:
Why does alternate_species cover both alternate species and alternate forms, while alternate_form actually means alternate design
the suffixes for tags such as anthrofied, taurification, and feralized ought to be unified, though as noted earlier anthrofied and furrification do not exactly parallel the other tags either.
Updated