/ Thesaurus / S Synonyms of sheep dog Find synonyms for: Noun1. shepherd dog, sheepdog, sheep dog, working dogusage: any of various usually long-haired breeds of dog reared to herd and guard sheepWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: confectionery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language