Starring Owen Wilson, Jennifer Aniston and Alan Arkin Directed by David Frankel Newlyweds John (Wilson) and Jenny Grogan (Aniston) ponder the life-changing decision to start a family. Unsure of his preparedness for raising children, John confesses his fears to his friend who suggests that Jenny should own a dog first. Adopting the adorable, Labrador pup, Marley soon grows into a 100-pound steamroller of unbridled energy that turns the Grogan home into a disaster area. However, through the years and the mayhem, Marley sees the Grogans through the myriad challenges of a growing family. As John and Jenny come to realize, Marley - "the world's worst dog" - somehow brings out the best in them.