Animal Metaphors

It's a long-standing tradition in fiction to use animal metaphors, both to describe a character and to describe actions of a character.

What does it really mean to say someone's piggy? What if they're cat-footed? Sometimes people even go to the extreme and go all the way to having animals as characters - usually as children's stories, or it gets viewed as a children's story even if it isn't mean to be one (Watership Down?).

Writing prompt: Take one of your character sketches, and think of animal metaphors for that person. Add some. Do they change the view of the character? The story?