When a little boy throws a coin in a well asking for a pet unicorn, he has no idea what kind of trouble he's in for. Unbeknownst to him, unicorns make the absolutely worst pets: they shed, they poke holes in your ceiling, and they make a big mess. With a knowing wink from Ame Dykeman, creator of and cheerful illustrations from Rory the Dinosaur creator and Tumblr star Liz Climo, this rollicking story shares all of the ways a pet unicorn can ruin your life, and is sure to have readers in stitches.