Definition & Meaning of "every dog is valiant at his own door"in English

What is the origin of the proverb "every dog is valiant at his own door" and when to use it?

The origin of the proverb "every dog is valiant at his own door" is unclear, but it reflects a common idea found in many cultures. The phrase suggests that individuals often show great courage and strength when they are in familiar surroundings, just as a dog may appear brave or powerful in its own territory but might act differently in unknown or threatening situations. It highlights the idea that confidence can be tied to one's comfort zone, and people may appear bold or fearless when they are in a place where they feel secure. The proverb is often used to point out that true bravery is revealed in unfamiliar or challenging circumstances.