My sister made the joke, so I couldn’t resist drawing it out. =P
(And to clear up confusion I’ve seen, yes: both Bellwether and Doug are sheep.
And all sheep have those weird rectangular pupils in real life.
They decided to give Bellwether ‘normal’ eyes to help the audience relate to her as a “cute little sheep”. They succeeded, but it was a slight inconsistency among the sheep species depicted in the movie. Oh well… Still cute.)