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sheepdog

American  
[sheep-dawg, -dog] / ˈʃipˌdɔg, -ˌdɒg /
Or sheep dog

noun

  1. a dog trained to herd and guard sheep.


sheepdog British  
/ ˈʃiːpˌdɒɡ /

noun

  1. Also called: shepherd dog.  a dog used for herding sheep See Border collie

  2. any of various breeds of dog reared originally for herding sheep See Old English sheepdog Shetland sheepdog

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of sheepdog

First recorded in 1765–75; sheep + dog