落水狗上岸 luòshuǐgǒushàng'àn shaking like a dog out of water
(xiehouyu) like a dog that fell into the water and just climbed out, shaking its body to dry off; used to describe someone shivering uncontrollably (e.g., from cold or fear). The pun relies on "qióng dǒu" (literally: shaking incessantly or miserably)