Gǒu yǎo gǒu, liǎng zuǐ máo.

狗咬狗, 兩嘴毛。

Lit [When] dog bites dog, both [get a] mouthful of hair.

Fig When two (bad) parties engage in (an unjustifiable) dispute, they both end up losing or looking badly. “A curse upon both their houses.”

Note [Often used to describe two of the speaker's enemies fighting; gǒu-yǎo-gǒu refers to a “dog-eat-dog” conflict.]

Topics CONFLICT CURSE DISPUTES dog-eat-dog ENEMIES