Who Let The Dogs Out? is the 2nd of the 22 chapters in The '00s. It is the first chapter to feature Dexter making the pilot chapter the only chapter not to have any animal included in the story. The main focus of the episode is Dexter when the Sharp household takes him in early in October 2001. The title is named after the famous hit song "Who Let The Dogs Out?" by Baha Men that came out in the 2000s.