Noun
running dog (plural running dogs)
(derogatory) A lackey; a lapdog; an unprincipled person who helps or flatters other, more powerful and often evil people.
In many ways, the right-wing Suvorin, whom Lenin later called "The running dog of the Tzar " (Payne, XXXV), was Chekhov's opposite; "Chekhov had to function like Suvorin's kidney, extracting the businessman's poisons." Source: Internet
The Afghan Hound (a type of running dog) originated in Afghanistan and was originally used in hunting. Source: Internet