An Elephant and PIggie Book: A Big Guy Took My Ball! by Mo Willems

Gerald is careful. Piggie is not.
Piggie cannot help smiling. Gerald can.
Gerald worries so that Piggie does not have to.

Gerald and Piggie are best friends.

In A Big Guy Took My Ball! Piggie is devastated when a big guy takes her ball! Gerald is big, too . . . but is he big enough to help his best friend?