Jennifer Aniston and Owen Wilson unleash huge laughs as John and Jenny Grogan, a young couple contemplating the decision to have a baby.Then came Marley,an adorable Labrador puppy who flunks obedience school and quickly turns his new home in to a disaster area.But as mischievous Marley sees the Grogans through the ups and downs of life and love, they ultimately realise that "the worlds worst dog" truly brings out thebest in them.