On a rainy day, Frank’s parents take him to the shelter to get a new dog. That’s how Frank finds Lucky, and from that moment on, they’re inseparable. As Frank and Lucky venture out into the world around them, they discover they both have a lot to learn. Exploring their neighborhood teaches them about biology: Lucky learns all about squirrels, deer, and—unfortunately for Frank—skunks. Sharing a bed teaches them about fractions—what happens when one dog takes up three-quarters of the bed, or even the whole thing? They even learn different languages: Frank makes a friend who speaks Spanish and Lucky tries to learn Duck! Who knew you could learn so much without ever setting foot inside a classroom?