one of an Australian breed of medium-sized herding dogs with a blue, blue-mottled, or red-speckled coat, developed by cross breeding the Australian kelpie, dingo, and collie.
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British Dictionary definitions for Australian cattle dog
a compact strongly-built dog of a breed with pricked ears and a smooth bluish-grey coat, often used for controlling and moving cattle
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