A huge mistake is to use
狗腿子 to describe a simple assistant, subordinate, or follower.
狗腿子 is an extremely negative term implying moral corruption and servility. A neutral word for an assistant is
助手 (zhùshǒu), and a more general term for a follower is
跟班 (gēnbān), which itself can be slightly negative but lacks the venom of
狗腿子.