Police officers are being trained to react to dogs passive acknowledgement of the presence of explosives on the streets of major cities.
The dogs are being selected for their scuffy appearance which will relate to their handlers disguised as tramps and will be able to detect explosives without barking or moving towards any threat.
The tactic is the latest attempt by the Metropolitan Police to counter the threat of suicide bombers in the wake of threats to major western cities.
In the training project, which is taking place at the Mets kennels in Keston, Kent the dogs will be being training alongside springer spaniels.
Others police forces at home and overseas are watching the progress of the project with interest.