On the Loose is the 543rd episode of The Bill.
P.C.s Loxton and Garfield corner a savage pit bull terrier that escaped from an illegal dog fight. Sgt. Boyden tracks down a pensioner who has turned to crime in order to pay off a loan shark.
In 2022, writer Candy Denman and director Laurence Moody shared memories of this episode for a The Bill Podcast Video Commentary