1. (chiefly British slang) a menial worker; drudge. (plu. -bodies)
English, 1810–20; orig. a junior naval officer, earlier a sailor's term for soaked sea biscuits or pease pudding
"Dogsbody" as currently used in Great Britain signifies a flunky of all work, a person on whom any kind of task can be imposed.
--A Shaping Joy: Studies in the Writer's Craft, Cleanth Brooks