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Winners and losers, high stakes, it's jeopardy week in week out. Tonight the oldest bookmaker in Britain will face the most celebrated gambler in dog racing history. But public interest is waning – with attendance declining and profits falling, there won't be many more of these nights. Gone to the Dogs showcases the dwindling culture of greyhound racing at Walthamstow Race Track soon before its closure in 2008, providing an insight into the lives of its staunch and passionate inhabitants, contrasted with casual visitors seeking nothing more than light entertainment. [episode from a Channel 4 documentary series]