There are 6 books in the The Oatmeal series. The newest book is How to Tell If Your Cat Is Plotting to Kill You which came out in 2012.

1
If My Dogs Were a Pair of Middle-Aged Men

Book cover of If My Dogs Were a Pair of Middle-Aged Men
From the Eisner Award-winning creator of The Oatmeal and #1 New York Times bestselling author of How to Tell If Your Cat Is Plotting to Kill You comes this charmingly absurd gift book about man's best friend.

In If My Dogs Were a Pair of Middle-Aged Men, Matthew Inman imagines,…
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2
How to Be Perfectly Unhappy

Book cover of How to Be Perfectly Unhappy
Matthew Inman-Eisner Award-winning creator of The Oatmeal and #1 New York Times bestselling author of How to Tell If Your Cat Is Plotting to Kill You-serves yet another helping of thoughtful hilarity in this charming, illustrated gift book for anyone who is irked by the question: "Are you happy?"

In…
This is not just a book about running. It's a book about cupcakes. It's a book about suffering.

It's a book about gluttony, vanity, bliss, electrical storms, ranch dressing, and Godzilla. It's a book about all the terrible and wonderful reasons we wake up each day and propel our bodies…

4
Why Grizzly Bears Should Wear Underpants

Book cover of Why Grizzly Bears Should Wear Underpants
In this third collection of over 60 comics, you'll be treated to the hilarity of "Dear Sriracha Rooster Sauce," "The Crap We Put Up with Getting On and Off an Airplane," "Why Captain Higgins Is My Favorite Parasitic Flatworm," "This Is How I Feel about Buying Apps," "What it Means…

5
My Dog

Book cover of My Dog: The Paradox
When The Oatmeal.com posted his comic My Dog: The Paradox, which is a loving ode to his dog, Rambo, the comic took off in a blaze of retweets (15,000+) and Facebook likes (586,000+) and was shared over 25,000 times on Facebook within days. The Oatmeal.com now presents this endearing tribute…

6
How to Tell If Your Cat Is Plotting to Kill You

Book cover of How to Tell If Your Cat Is Plotting to Kill You
Brilliantly whimsical yet oddly informative, TheOatmeal.com is an entertainment site full of comics, quizzes, and stories. Matthew Inman, creator of TheOatmeal.com, is a king of all trades when it comes to the Web. He writes, draws, and codes everything on the site, and his viral marketing skills make the site…