Knuffle Bunny: A Cautionary Tale (from Dutch knuffel, pronounced k-nuffle[1]) is a classic children's picture book written and illustrated by Mo Willems.

The three run back to the laundromat, and after several tries, Mo finds the toy among the wet laundry, and claims hero status.

Kirkus Reviews wrote, "The natural audience for this offering is a little older than its main character: they will easily identify with Trixie’s grief and at the same time feel superior to her hapless parent—and rejoice wholeheartedly at the happy reunion.

"[9] The story's audio version, narrated by Mo, Cheryl, and Trixie Willems, received the 2007 Audie Award for Children's Titles for Ages up to 8.

In 2019, the Park Slope branch of the Brooklyn Public Library unveiled a statue of Knuffle Bunny.

[3] The final installment features an epilogue in which Willems sends a poignant message to his real daughter, Trixie,[13] wishing her well in her life as an adult.