In this 2014 photo, a Kangal dog walks with a heard of sheep at the Hutterite Rockport Colony near Pendroy, Mont. Nearly 120 dogs from three large breeds perfected over centuries in Europe and Asia to be gentle around sheep and children but vicious when confronting wolves recently completed a four-year study to see how they'd react to their old nemesis on a new continent. The U.S. Department of Agriculture supplied Cão de Gado Transmontanos, Karakachans and Kangals that can weigh 150 pounds to guard sheep in Idaho, Montana, Wyoming, Washington and Oregon. (Julie Young/U.S. Department of Agriculture via AP)
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