Sam the Lion is actually a priceless dachshund, bred to be a show dog. More important, he is Heidy's best friend, and she needs one like never before. Living with her reclusive uncle is hard, but Sam has a way of making her feel soft and whole. Until the day Sam is framed by the jealous poodle Cassius, and is cast out by Heidy's uncle, alone on the wild streets, where he is roughed up by a world he was not bred for. Sporting a soup ladle for a leg, Sam befriends other abandoned dogs and journeys all the way to the Westminster Dog Show, where his plan for revenge on Cassius takes an unexpected turn when he and Heidy spot each other after years of being apart.