(simile) Stubborn and tenacious; persistent; relentless; dogged.

A breed of herding dog developed in Australia for controlling cattle. Varieties include the Queensland Heeler, Blue Heeler, and Red Heeler.

A type of bun shaped specifically to contain a hot dog sausage.

(US, informal) A guide dog for people who suffer from impaired vision.

African hunting dog

A wild canid, Lycaon pictus, typically black, white and tan, found in Tanzania, Kenya, Zimbabwe, Botswana and South Africa.

Alternative form of shaggy dog story.

a cry of delight or enthusiasm

A long-winded joke or tale featuring the narration of typically irrelevant details, and usually ending with an absurd or pointless punchline which is often a pun or Spoonerism on a known catchphrase.

(idiomatic) Used as a mild oath, or as an expression of astonishment