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 own pet—and Murphy for his best friend. This vacation is turning into a bust! Yet help is not far away. Another camper, Pedro, might prove to be an ally against Dmitri and his plots. Even better, a shirt drive from the campsite, a mysterious pet shop appears out of nowhere: Petopia. Pick up the latest installment of this award-winning, hilariously funny middle-grade series!