Meaning of the word "every dog is valiant at his own door" in English

What does "every dog is valiant at his own door" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

every dog is valiant at his own door

US /ˈev.ri dɔːɡ ɪz ˈvæl.jənt æt hɪz oʊn dɔːr/
UK /ˈev.ri dɒɡ ɪz ˈvæl.i.ənt æt hɪz əʊn dɔː/
"every dog is valiant at his own door" picture

Idiom

everyone feels brave and confident in their own familiar territory or home

Example:
He acts like a boss in his office, but remember, every dog is valiant at his own door.
Don't be intimidated by his threats while he's at home; every dog is valiant at his own door.