New York Times best-selling author Jonathan London explores how even the smallest Hippo can be a big help when he teams up with his friends.

Little Hippo loves to pretend, and today he is playing a doctor. He tries to examine Big Hippo, Very Tall Giraffe, Giant Crocodile, Elephant, and other patients. But not everyone plays the way Doctor Hippo expected. Especially not Lion. Lion does not want to play Doctor Hippo's game. When he lets out a huge roar, the little doctor races home to find that Mama Hippo's medicine is the best of all. Jonathan London's reassuring story is perfectly matched by Gilles Eduar's warm and whimsical illustrations.