Eleven-year-old Cyrus knows he is not cut out to be a football hero or fireman like his adopted father, but it takes a skittish stray dog to teach him that he, too, can be brave.

While on a field trip to a fire station with Mrs. Gray's class, Curious George goes off on his own and is soon at the scene of a fire, where he finds a way to be helpful.

Who will be the next firehouse dog? It's time for the Fire Dog Challenge at the Birdwell Island Fire Department! Clifford's friend Tucker wants to earn his Bravery Badge and become the firehouse dog. But some of the tasks are too scary. What will Tucker do? Can Clifford help his friend overcome his fears and win the Fire Dog Challenge?