Herding Dog Family Tree
The following diagram shows how the Smithfield is in a distinct class of its own with a loose tie to the Australian Koolie. 
Research also indicates the Smithfield may have played a role in the development of many other newer breeds, including the Australian Cattle Dog (aka the
Timmins Biters) and Lurchers.
Courtesy of www.roughcolliesofdistinction.com
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