(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.

(mushing) one of the dogs directly in front of the sled that take most of the force.

(mushing) one of the dogs at the front of the team, who set the pace.