When humble rancher marries a movie star, his son Josh, an introvert, finds himself with a new step-sister, Lacey, a spoiled Hollywood brat. It quickly becomes evident that their two kids will not get along, and neither will their respective dogs. With the parents away for their honeymoon, two bumbling thieves scheme to break into their house. Can Josh and Lacey put their differences aside along with their four-legged friends and team up for the better?