Last year I learnt what this interesting term means from an unexpected source. It's the Victorian profession of gathering up "dog chocolate" for use in tanneries, because, unbelievably enough, the stuff was believed to be "pure". There's even a poem.
It's one of those great long-abandoned career paths, like abacus operator, footman, or pyramid designer. A list to which we will soon be able to add oil industry executive, SUV salesman, and environmental consultant to Donald Trump (left).
Or my dream job: BBC Radiophonic Workshop technician :(