Despite the attack, he was able to keep control of the man for long enough to allow officers to take hold of him.
Kaiser was taken to the vets where it was found the blows to his head had struck bone, meaning he narrowly avoided lasting injury.
At the time, Superintendent Emma Richards, from the Met’s Taskforce, which includes the Dog Support Unit, said Kaiser was “lucky to be alive”.
Sharing news of his return to duty on Friday, the Sutton Police Facebook page said: “After being brutally stabbed in June, PD Kaiser and his handler PC Woolcott were welcomed back by our Borough Commander Dave Stringer and The Mayor & Mayoress of Bromley this morning.
“Kaiser was absolutely delighted upon receiving a new toy which was gifted to him by The Mayor for his bravery.”