Learn English – Why do people say “Work like a dog?”

idiomsmeaning

To mean working hard?

Dogs just lie around and nap. That's not working hard…

Best Answer

"Sheepdogs" are definitely a reason. This link here, also offers another explanation:

In olden days, the two sawyers who worked on a tree sawing planks were the top-dog and the under-dog. A dog in those days was a manual worker. (Emphasis mine)

Perhaps the expression could also have come from a comparison with a "manual worker".

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