Before the Seavers leave for a family vacation to San Francisco, they drop off their pets -- Chance, an adventurous American bulldog; Shadow, a wise golden retriever; and Sassy, a cautious cat -- at a friend's ranch. But when the animals start to worry that they've been left for good, the three embark together on a treacherous and thrilling journey to find their way back home through the California wilderness. A fun-loving American bulldog pup, a hilarious Himalayan cat, and a wise old golden retriever embark on a long trek through the rugged wilderness of the Sierra Nevada mountains in a quest to reach home and their beloved owners.