Shane Fahey (JOSH HUTCHERSON) is a kid who doesn't think he's gotten a fair shake in life. His mother left him when he was two, his dad Connor (BRUCE GREENWOOD) is the captain of the local firehouse, and his uncle -- the previous leader -- perished in the line of duty the previous year.
While the other firefighters there -- Joe Musto (BILL NUNN), Lionel Bradford (SCOTCH ELLIS LORING), Pep Clemente (MAYTE GARCIA) and rookie Terence (TEDDY SEARS) -- have unofficially adopted Shane, he isn't happy. Accordingly, he often skips school, unlike classmate J.J. (HANNAH LOCHNER), daughter of Jessie Presley (CLAUDETTE MINK), the captain of a rival firehouse that's always on the scene of any fire before Connor's crew.
It then goes from bad to worse when former firefighter turned city manager Zachary Hayden (STEVEN CULP) informs Connor and his crew that their station is likely to be shuttered and their team split up. Things take a turn for the better, however, when a mutt -- "Dewey" -- they've rescued from a fire turns out to have quite the nose for firefighting. Soon, his heroics get the station some much-needed press -- thanks in part to businessman Corbin Sellars (MATT COOKE) -- and a reprieve from the chopping block.
Yet, while his dad focuses on what he believes is a string of arsons, Shane is completely unaware that Dewey is really Rexxx, the huge Hollywood dog star of films such as "Jurassic Bark." Following a parachuting stunt that went wrong, his trainer Trey Falcon (DASH MIHOK) and production assistant Liz Knowles (BREE TURNER) assumed the pampered star perished in the accident, not realizing he landed safely and eventually ended up with Shane.
From that point on, the boy becomes progressively attached to the dog -- just like everyone else at the firehouse -- not realizing he might be taken away from them at any moment.