Gumpaloffagus, a kid dinosaur, sure is grumpy! He experiences many versions of grumpiness from physical things like being hungry, tired, or hurt, to feeling more complex emotions like embarrassed, scared, frustrated, and more. After exploring reasons for grumpiness, Grumpaloffagus then discovers ways to work through his emotions.

Though this book is fun, silly, and engaging, it has the added benefit of being a tool to help children understand and navigate their emotions. Grumpaloffagus helps to provide children with a base understanding that "grumpy" comes in many different forms, and provides verbiage and context for emotions to better facilitate conversations about their feelings.