The dawn of the CG age has enabled us to see some miraculous sights. Dead public figures brought back to life, sprawling alien vistas, and this; crime fighting Guinea pigs.
Within moments of the start of the film, the audience is asked to believe the central premise of G-Force; that technology has been developed which allows guinea pigs to be able to speak perfect English. Once an audience has accepted this, for the purpose of entertainment they rightly will believe anything. So it’s not a terrible stretch to believe that they can fight crime, drive, dance etc. All of which, rest assured, occur in its scant 80 minutes run time.