From Book 1: A New York Public Library Best Book for 2018 Sassy and Waldo are good dogs. They spend the day keeping their house safe. Has a squirrel ever gotten inside? No! But every day their boy, Stewart, comes home from this terrible place called school smelling like anxiety and looseleaf paper.

Sassy and Waldo decide to save Stewart. But they don't let dogs into school. So Sassy and Waldo decide to get creative. They put on an old trench coat, and now everyone at Bea Arthur Elementary thinks they are a new student named Salty from Liver, Ohio. Well, everyone except Stewart.

Sassy and Waldo love school! Everything smells like meat and dirty socks. And they discover a whole other way to help out Stewart!