Clyde, a 16.3hh Thoroughbred-Clydesdale cross, will now spend his time at the Horse Trust's sanctuary in Speen, Buckinghamshire.
He is also known for his bravery when policing riots, demonstrations and clashes while working to control crowds.
In June this year Clyde received a commendation from The Queen at Royal Ascot in recognition of his long service.Sergeant John Thurston, from Thames Valley Police's mounted section, said he is one of the longest serving police horses in the UK.
He said: "He's had everything thrown at him - petrol bombs, flares, bottles and nothing bothers him. We often used him as the lead horse as he's so brave and responsive."
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