Wikipedia:Reference desk/Archives/Language/2025 May 20

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May 20

Dog knows dog

I searched hours but didn't find any specific useful information about its origin. I will appreciate any help. Omidinist (talk) 17:42, 20 May 2025 (UTC)[reply]

I don't know if it was original, but the earliest use I found, with "dog" in its literal sense, referring to man's best friend, is here, from 2018. The next use is from the same author, less than a year later. The first use I saw with "dog" in the sense of "all men are dogs" is in a comment posted in 2022 on this Facebook video. Then the sense is that of it takes one to know one, with an echo of dog eat dog.  ​‑‑Lambiam 20:36, 20 May 2025 (UTC)[reply]

Thank you.Omidinist (talk) 21:13, 20 May 2025 (UTC)[reply]