As a former member of the dog unit myself, I know the strong bond between a police officer and his dog.
Whilst they are working dogs, they also become a close and important member of the police officer's family. This is a very sad occasion.
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The meeting was arranged in the wake of Wednesday's terrorist murder of four people in Westminster.
Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.