Nugget & Fang, by Tammi Sauer, illustrated by Michael Slack, Scholastic, 2015 (originally published in 2013).
There is a very important lesson in this funny and adorably illustrated book: Friends don't eat friends.
OK, I'm just kidding -- that is not the real lesson. The real lesson is about acceptance, understanding, and what it means to be a friend.
But, in case you are wondering, friends don't eat friends.