What does it mean that every dog knows the meaning of the idiom?

What does it mean that every dog knows the meaning of the idiom? - briefly

It indicates that the idiom is so widely understood and used within a culture or language community that even those without formal education can comprehend its meaning, suggesting its deep-rooted presence in everyday language.

What does it mean that every dog knows the meaning of the idiom? - in detail

The phrase "every dog knows" is an idiomatic expression that conveys the idea of something being obvious, well-known, or universally understood. When applied to idioms, this phrase suggests that the meaning of the idiom in question is so clear and apparent that even a dog could comprehend it. This usage emphasizes the straightforwardness and simplicity of the idiom's message, implying that its significance is immediately recognizable and requires no further explanation. The expression underscores the universal nature of certain idioms, highlighting how deeply ingrained they are in common language and understanding.