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As per the BBC website, the former Reading striker was today sentenced at Luton Crown Court.
Dixon, 53, denied assaulting the man at a pub in Luton in May 2014, but was convicted of the offence last week.
Luton Crown Court heard the assault was captured on CCTV cameras at the Nag's Head in Dunstable.Judge Barbara Mensah described the attack as "shocking and sickening to watch".
She said the violence was "disproportionate, unnecessary and completely over the top".
The former striker, told the court he had been acting in self-defence and thought his victim, Ben Scoble, was going to hit him in the face with a glass.
Dixon joined the Royals from non-league for just £20,000 back in 1980 and the forward went on to have an excellent career at Elm Park, scoring 51 goals in just 116 games.
That form led him to sign for Chelsea three years later for an initial £150,000 where he scored 193 goals, good enough for third on their all-time scorers list. His good run also led to an England call-up and Dixon would go on to score four times in eight games for his country.
Dixon retired in the late nineties and went on to have a career in the media.