This is a story about a little lost dog that wanders into a Firehouse and is fascinated by the bells, sirens, ladders, wagons and hoses. The firefighters let him stay around and name him, "Dog." The puppy grows up, grows stronger, pulls hoses around and can even jump up on the firewagon. It is also the story of how a little puppy grows into an adult dog and becomes the hero of the firehouse.