Book Series · 2 Books

On the Job Books

In order from Dog Walkers to What Hat Is That?.

The On the Job series is a set of 2 picture books by Joseph Otterman and Nichole Mara, published between 2018 and 2025. Written for ages 2–10, most books run about 25 pages.

Dog Walkers
What Hat Is That?
Dog Walkers
Dog Walkers
What Hat Is That?
Where the story begins

First Book in the Series

Dog Walkers
Sale price
$958
Book #1 · Picture Book · Ages 5–10 · 2018

Dog Walkers

By Joseph Otterman

One dog walker, five dogs. Can math solve the chaos?

24 pages
$9.99Save 4%
Perfect Paperback
Summary: A lone dog walker faces the challenge of managing five energetic dogs. Dive into a world where math meets real life, using data collection and problem-solving to untangle the leashes. With engaging images and practice problems, this book turns math into an exciting adventure. Will the walker find a way to keep the dogs in line? Discover how numbers can bring order to chaos and learn valuable skills along the way. Perfect for young readers eager to explore math in action.
The complete set

On the Job Series

2 books · Published 2018–2025

Series
Sale price
$958

Dog Walkers

Picture Book · Ages 5–10 · 2018

One dog walker, five dogs. Can math solve the chaos?

What Hat Is That?

Board Book · Ages 2–5 · 2025

Guess the job with Grover using hats as clues in this interactive adventure!

Good to know

Common Questions

How many books are in the On the Job series?

There are 2 books in the On the Job series. It began with Dog Walkers in 2018, and the newest book, What Hat Is That?, was published in 2025.

What ages are the On the Job books best for?

The series is best for ages 2–10, based on the age ranges of the individual books.

The people

The Creatives Behind the Books

The authors and illustrators who bring On the Job to life.

01

Joseph Otterman

Author
02

Nichole Mara

Author
03

Andrew Kolb

Illustrator

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