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.

Three pets (Chance, a young dog unfamiliar with the world; Shadow, an aging, wise dog; and Sassy, a snobby cat) are left behind when their owners go on vacation. Unsure of what happened, they set out on a quest to find their owners.

This journey across America is very dangerous and they risk never seeing their owners again. They travel across forested mountains and areas of wide-open countryside, while their owners search for them in the same areas.