Gordon, (David Arquette) is an offbeat mailman who has never met a dog he couldn’t handle. When he offers to baby-sit James (Angus Jones), the young son of his beautiful neighbor Stephanie (Leslie Bibb), he’s hoping she’ll return his romantic interest. But a runaway FBI canine, Agent Eleven, sneaks aboard Gordon’s mail truck, and is adopted by James who names him “Spot”. Spot is pursued by mobsters who he has busted and by his partner, Agent Murdoch (Michael Clarke Duncan).

When the mobsters catch up to Spot and his new friends, the fur flies and Spot gets to show off his true colors. In the end, Gordon and James are remarkably transformed and the Spot must choose between his new family and his life as a crime-fighter.