After his new wife's family convinces her to leave him, attorney Dan Preston leaves his law practice and sets off to travel around the country as a vagabond. When he returns home he finds his house rented by a novelist, Shirley Haddon. He adopts a mongrel dog, Picardy Max, and sets out to avenge himself against his ex-wife's family by entering Max into dog shows to compete against their pedigreed animals. Preston also begins a romantic relationship with Haddon.