A dog catching mice; the first part of the two-part allegorical saying 狗拿耗子，多管闲事 gǒu​ná​hào​zi​duō​guǎn​xián​shì, meaning to meddle in other people's business

to poke one's nose into other people's business; to be meddlesome (often in the phrase 多管闲事 duō​guǎn​xián​shì)