Detectives Briscoe and Green are called to the scene of a vicious dog attack in which a woman was mauled to death and as they rush to track down the ferocious animal before it strikes again, they trace the dog's ownership to a prisoner in Attica already serving two life-terms. Executive A.D.A. Jack McCoy and A.D.A. Serena Southerlyn must determine who among the prisoner's few outside contacts could have aided him in his fight-dog business, and who is ultimately responsible for the dog's trained propensity for deadly violence.
Episode number: 12x1 Production Number: E2208 Airdate: Wednesday September 26th, 2001
In the aftermath of 9/11, the main title voiceover by Steven Zirnkilton was changed for the first few episodes to include the following dedication: "On September 11, 2001, New York City was ruthlessly and criminally attacked. While no tribute can ever heal the pain of that day, the producers of Law & Order dedicate this season to the victims & their families and to the firefighters & police officers who remind us every day with their lives & courage what it truly means to be an American".
This voiceover was also heard at the beginning of Law & Order: Special Victims Unit and Law & Order: Criminal Intent, whose series premiere was suitably altered to reflect the events; the latter became L&O’s second spin-off.
Elisabeth Röhm (Serena Southerlyn) joins the regular cast in this episode.
Det. Lennie Briscoe: On the bright side, at least there's no barking. Det. Ed Green: Maybe they were trained not to bark. Det. Lennie Briscoe: Well, there's a cheerful thought.