junkyard dog

literally broadly idiomatic

(literally) An aggressive dog which guards a scrapyard or junkyard. / (idiomatic, by extension, hyphenated when used attributively) An animal or person with an especially nasty and combative demeanor.

Japanese Meaning

スクラップヤードやジャンクヤードを守る攻撃的な犬 / 非常に意地悪で好戦的な性格を持つ動物や人

What is this buttons?

A junkyard dog lunged at the trespasser, barking fiercely to warn everyone away.

Google Translation / DeepL Translation

廃品置き場を守る攻撃的な犬が不法侵入者に飛びかかり、激しく吠えて皆を遠ざけた。

Details

Sense（1）

(literally) An aggressive dog which guards a scrapyard or junkyard.

I saw nine dogs running en pack on South Washington Avenue ... They were making for a junkyard that appeared to be their headquarters ... And those junkyard dogs do make nights hideous for the neighbors

Google Translation / DeepL Translation