Cesar's next adventure in the UK starts on the wrong side of the law. Sally has a mixed breed pooch, Herbie, who was taken to court and put on trial for his life. Now Herbie must always be muzzled in public. If he can be proved safe the order could be revoked, but if he gets into trouble again he might be destroyed. Cesar steps in to help this doomed dog walking. Harriet and Matilda Thorpe are sisters and successful actresses who live around the corner from each other. They adopted German shepherd littermates Bruno and Diesel, who have grown wild and dominant with one another at the park. The sisters hope Cesar can teach them how to properly walk their dogs so they can once again enjoy living so close. Cindy and Nick have a peaceful existence, except when it comes time to load their 8-year-old English cocker spaniel, Paddy, into the car. They hope Cesar can show them a better way so they can bring Paddy on more trips.