a sheep dog.
(of a dog) trained to herd sheep.
Origin of huntaway
First recorded in 1910–15; noun, adj. use of verb phrase hunt away
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
NZ a dog trained to drive sheep at a long distance from the shepherd
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