Sassy and Waldo are good dogs who are about to be let loose on their first class trip! Sassy and Waldo are back! When Ms. Twohey announces that her class is going on a trip to the History Museum, Stewart is worried he's in for another long day of facts and learning. But nothing can be boring when you have two dogs in a trench coat along with you. Just hope they don't get too close to those huge dinosaur bones.