freight dog
n.— «Prince said Gross had been a flight instructor and a “freight dog” for the company for four years. A freight dog is a term for a pilot who flies cargo.» —“Pilot in plane crash identified” Pantagraph (Bloomington, Illinois) Nov. 10, 2005. (source: Double-Tongued Dictionary)
Further reading
Professional dog walkers call a dog obsessed with carrying sticks a branch manager. Another dog who grabs the other end of the stick and helps carry it around is jokingly called an assistant branch manager. This is part of a complete episode.
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