Sassy and Waldo have been cast in the school play and they couldn't be more excited. They love to play! Only this isn't that kind of play. Sassy and Waldo are good dogs. They will do anything for their boy, Stewart. That includes putting on a trench coat and pretending to be a new student named Salty in his class just to make sure he is happy. But this month Stewart's class is going to put on a play. PLAY! There's nothing that dogs love more than...

It is field trip day to the city museum, and while Stewart expects a boring day of facts and learning, Waldo and Sassy are looking forward to lunch; then they find that the dinosaur room is full of tempting bones, the astronaut boots are good for chewing, and one of the dioramas features a squirrel on a sidewalk, but the highlight is the delicatessen--if only Waldo and Sassy's disguise can fool the guards who are searching for two dogs.