Explosive detection dog Caesar is in Texas with his handler, Ben, to train the local police. When a bomb detonates nearby and Caesar sniffs out a second bomb at the scene, he attracts the wrong kind of attention.
Mexican crime lord Carlos Marron, known as the Green Parrot, decides that the world-famous labrador can protect him from the kind of bomb attack that targeted his brother. Carlos orders his subordinates to dognap Caesar - and when Ben leaves Caesar in quarantine, the gang swoops.
Now, Ben, Charlie and the GRRR team have to locate and rescue Caesar in Mexico, in the middle of a deadly crime cartel war.