This is the story of Romeo. A dude who was living the life. He had the works - the mansion to live in, the chicks to party with and the cars to be driven around in. Until one day, the family he was the favorite pet of, decided to move and left him back, abandoned on the mean streets of Mumbai. Romeo is now faced with situations he has never been in before. He encounters four strays, who scare the daylights out of him. But soon, he smooth talks his way into their hearts and he makes friends. Then, Romeo finds love! He encounters the beautiful, ravishing Laila, the most beautiful girl he has ever seen - and he loses his heart to her at first sight. Finally, he encounters a villain! The dreaded Don of the area - Charlie Anna. The Don who everyone is scared of. So hop on to the adventure as Romeo, wins friendship, love and a new life - inspite of Charlie Anna and his gang! Watch how Romeo turns into - Roadside Romeo! This Diwali - Get ready for a barking good time!!—Anonymous

Romeo (Saif Ali Khan) lives the high life as a pampered pooch, until his owners move away and kick him to the curb. Now facing life on the mean streets of Mumbai, Romeo knows he must adapt, or die. But things are looking up for this smooth-talking canine. He meets and falls in love with the ravishing Laila (Kareena Kapoor), and wants to live happily ever after with her... if only he can get past the neighborhood's most feared crime lord: Charlie Anna (Jaaved Jaaferi).