Board Thread:General Discussion/@comment-23579547-20130926235430/@comment-13215692-20130927101654

Basically it's adding bunny ears to replace Holo's (Spice and Wolf) wolf ones (Because Ruby is the one with the wolf motive in the series).

http://images2.wikia.nocookie.net/__cb20120213085447/spiceandwolf/images/4/4b/Holo_Profile.gif