A type of dog, used for droving cattle

(chiefly UK, slang) A complete mess.

(US) A hot dog with processed cheese spread on it.

(US politics) A member of the Blue Dog Coalition, founded in 1994, of conservative and moderate members of the Democratic Party.

(US, colloquial) A long time; many years.

(derogatory) A lackey; a lapdog; an unprincipled person who helps or flatters other, more powerful and often evil people.

(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.

Alternative spelling of junkyard dog

A herding dog native to Israel.

(mushing) One of the dogs directly behind the lead dogs, who help set the pace.