So I have Prior Maborel's Paint Horse outside Chestnut Handy Stables.
I go inside and have three armor options (since I've completed the Order but not the Cataclysm quests on this character).
If I choose elven or steel armor, the horse is gone when I go outside. Seems to be totally lost. Not sure if this has to do with completing the Order quest or not.
If I choose Order armor, her voice line plays with no lip movement. The horse is properly armored and outside but is named Prior Maborel' Horse (Armored). So missing an s and the word Paint is removed (character limit?).