No one could love camping more than Rufus. He and his best friend, Murphy, and their families and pets, including Fido, Rufus's famous guinea pig that acts like a dog, are planning to camp by a beautiful lake and relax and have fun. Then his mom announces that, without telling him, she has invited two kids who drive him totally crazy. Lurena brags that she is an expert on all things guinea pig. Dmitri wants Fido for his...