Sheep
From WikiFur, the furry encyclopedia.
There are very few sheep characters (or Ovines) in the furry fandom, compared to other species. There could be any number of reasons for this, including lack of glamour or perceived exoticness, or even that sheep aren't considered sexy or yiffy enough. Or perhaps yiffy in the wrong way; there are many jokes which make reference to sheep as sex objects.
Another reason may be that sheep are seen as trend followers (for example, Felicia in Ozy and Millie), while furry fans seek to be anything but that. It should be noted that foxes and wolves, both seen as very individualistic, are among the most popular choices for fursonas.