The tag alias #74385 horns_and_hooves -> horn is pending approval.

Reason: Someone else brought it up on the discord. It's a copyright tag- I suspect it may have been someone's abandoned personal project or setting. Regardless, it's been (if it was intended as a copyright tag) mistagged into oblivion.

It's also just not really a valid tag. You don't really see tags for combinations like horns_and_paws or wings_and_tail.