Phil and Debbie Winslow embark on a new adventure, moving from Kansas to sunny Orange County. Their lovable yet mischievous Great Dane, Marmaduke, quickly embraces the laid-back Southern California lifestyle. As he navigates the challenges of his new environment, Marmaduke's antics lead to hilarious situations, showcasing the joys—and chaos—of canine life in a vibrant new setting. With the Winslows adjusting to their new home and Marmaduke stealing the spotlight, the family learns valuable lessons about friendship, acceptance, and the true meaning of home.