狗咬狗不知死活
[gŏu yăo gŏu bù zhī sĭ huó]
Gǒu yǎo gǒu bù zhī sǐ huó (Dogs biting each other don't know if they're dead or alive) refers to a quarrelsome situation between people who can’t tell friend from foe; similar to 'fighting like cats and dogs'. Used often as criticism of unending conflicts