A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 3 December 2007
Can I use Unicorn Wardogs abilities while he's unoposed? It's text says that you may target a personality of follower. Because of that I had that doubt.
Unicorn Wardogs
Unicorn Clan • Nonhuman • Cavalry Can not attach cards. Battle: If you control a Human Unicorn Clan Personality in this army: You may target and bow a Follower or Personality without Followers opposing Unicorn Wardogs. Give Unicorn Wardogs +2F.
Zen Faulkes (rules official), 3 December 2007
Can I use Unicorn Wardogs abilities while he's unoposed?
Yes.