He added: ''That's why in order to get through the licensing process Nipper had to be tested in a number of key areas - tracking, searching, bite work, agility and obedience.

BBC: Nipper and Constable Ryan Galloway

Every character got their arc, every character had time to develop and build relationships with other characters, and every character suffered some kind of challenge that tested them and forced them to overcome limitations and obstacles in order to be a strong link in the chain for the team.

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