Inquisitive, detail-oriented, Veterinarian Kristin Keller prides herself on winning over any dog. But has this self-proclaimed dog whisperer finally met her match in a Sheltie named Remington who has just won the Texas state agility course competition? The champion pooch is acting out of sorts—almost as if he is not the same dog. Has he, by chance, been switched out with another dog just before the next big competition? Kristin and the other Lone Star employees will do anything to help the Atkinson family figure out this mystery surrounding their beloved Remington.