是人是狗我一眼能看清
[shì rén shì gŏu wŏ yī yăn néng kàn qīng]
'Whether human or dog, I can tell at one glance' means the person has an ability to see through facades. It suggests sharp intuition or discernment, being able to judge someone's true nature swiftly, implying no pretenses can fool them.