A police dog trained to sniff out illegal goods such as drugs or explosives.

plural of dog and bone

A dog trained to use its sense of smell to locate remains, usually human.

(idiomatic) Someone who denies to others something that he or she cannot use.

Used other than figuratively or idiomatically: see yellow, dog. / (US, especially Southern US) A Carolina dog. / (US, informal) An item or person of low value.

(UK, Australia, New Zealand, Canada, idiomatic) An unappealing mixture; a disorderly situation; a mess. / Used other than figuratively or idiomatically: see dog, breakfast.

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

Alternative spelling of junkyard dog

(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.

A herding dog native to Israel.