To mistake a kind person for an enemy; to repay kindness with hostility, showing a lack of discernment or gratitude.
小明好心帮他找回了丢失的钱包，他却怀疑小明偷了他的钱，真是狗咬吕洞宾，不识好歹。
Xiao Ming kindly helped him find his lost wallet, but he suspected Xiao Ming of stealing his money. That's truly like a dog biting Lü Dongbin, mistaking good intentions for ill will.
Era:
Early Modern
Frequency:
Synonym:
Story:
Lady Wang instructed Jia Huan to copy the Diamond Sutra. Jia Huan then settled on Lady Wang's kang (a heated brick bed), had candles lit, and began to copy with an air of affected importance.
The maid Cai Xia advised him to focus on copying diligently. However, Jia Huan adamantly accused Cai Xia of favoring Bao Yu and treating him poorly.
Cai Xia, in response, scolded him, saying he was like 'a dog biting Lü Dongbin' —failing to recognize good intentions.
Just at that moment, Bao Yu and Wang Xifeng entered, leaving Jia Huan no choice but to secretly brood in annoyance.
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