In this heart-warming story about friendship and animals, Gillian the Dog is having the best summer ever, running around playing with her best friend Rolf the Human. But one day Rolf leaves without warning, going to some mysterious place called school. With the help of fellow pets Orlando the Bird and Mitzi the Cat, Gillian tracks Rolf all the way to the Big City, willing to undergo any trial it takes to reunite with her best friend.