A look at the work of the Metropolitan Police dog unit - 300 dogs and their handlers tackling crime in the capital in their own unique way. During the day, spaniels are sniffing out drugs on the streets of Camden, while in the dead of the night, German shepherd dogs will 'track and attack' armed robbers. These canines and their handlers are in the front line of the battle against crime in London.
An insight into the work of the police dogs of the West Yorkshire force as they hunt for drugs and track down burglars. Also featured are two of Europe's most famous canine detectives, Eddie and Keela - formerly employed by South Yorkshire Police - whose skills have been used in the hunt for Madeleine McCann and the investigation into allegations of child abuse in Jersey. Narrated by Ken Stott.
The work of British Transport Police's canine units, which help monitor the safety of commuters on thousands of miles of railway and underground track. The programme follows a spaniel trained to search for drugs, as well as police dogs that help their human handlers control the crowds at football matches. Ken Stott narrates.
A focus on the police canine unit in West Yorkshire, home to hard-working sniffer dog Bella and expert tracker Otto - who is on the hunt for an escaped car thief. Beth the German Shepherd is taken on an emergency trip to the vet and there is a profile of a dog capable of catching killers. Narrated by Ken Stott.
Cocker spaniel Diesel helps his handler PC Adele Gibson and the Territorial Support Group raids a suspected drug den. Sergeant Pete Madden and his German shepherd Brodie are on the trail of car thieves, while Paddy the English spaniel takes to the water with his companion PC John Lane.
PC Rogers reveals how he and Alsatian Leo help clear the streets of car thieves, and the officer comes up against a man who threatens to shoot him as the Greater Manchester Police dog squad tackles more criminals. A drunk driver takes on PC Greaves and his sidekick Riley, while spaniel Colin - who is trained to deal with explosives - and PC Carlin are put on the front line when a member of the Cabinet arrives in the city. Ken Stott narrates.
PC Dave Smith and his Belgian shepherd Kelly race to the scene of a burglary at a pet-food store, but when the suspects are found to have fled the scene, police helicopter India 99 is used to help track them down. PC Adele Gibson and her sidekick Diesel take part in a dawn drugs raid, and the London heats of the annual police dog trials give PC Andy Miller's dog Nelson the chance to test his skills. Narrated by Ken Stott.
Sgt Midgley tries to qualify as a dog handler after 24 years on the force but 14-month-old springer spaniel Ruby puts both their futures in jeopardy. The Greater Manchester Police dog squad remembers a close call with football fans during the 2008 Uefa Cup Final, and the 55-strong team deals with a siege involving a man with a knife, who is threatening to kill his family. Narrated by Ken Stott.
London's Metropolitan Police dog unit tests the skills of its leading specialist search dogs, pitting spaniels Diesel and Billy against each other as they hunt for hidden heroin. On the streets of north London, shift leader Pete Madden puts his Alsatian Brodie in the line of fire when they target two armed robbers, but as the trail runs cold they find themselves in pursuit of a gang of car vandals. Ken Stott narrates.
PC Greaves and his four-year-old German shepherd Riley track down a motorist who panicked when he saw flashing blue lights and ran off, while PC Whitaker and his dog Roscoe have to disarm a man who has a 12-inch knife. During a search of three vehicles used by a suspected drug dealer, sniffer spaniel Smut and handler PC Carlin find a wallet with almost £1,000 inside it hidden under a dashboard. Narrated by Ken Stott.
Father-and-son dog handlers John and Kevin Tozer join forces with their Alsatians Charlie and Floyd as the Metropolitan Police dog unit raids a suspected cannabis den. However, retirement beckons for John's canine companion, leaving 13-month-old Herbie as a possible replacement - if he can make it through basic training to join London's dog squad elite ranks. Narrated by Ken Stott.
Billy the new sniffer spaniel finds live ammunition during a search for drugs, and a stabbing on the streets of London brings together two of the city's leading Alsatian dog teams. PC Mandy Chapman and her canine companion Karly are sent in to enforce a court warrant against a dangerous dog, while Sergeant Peter Madden and Brodie are on the trail of burglars using stolen cars as getaway vehicles. Narrated by Ken Stott.