Oso, a Great Pyrenees, keeps a close watch on his sheep at the Barinaga Ranch in Marshall, Ca. on Wednesday April 25, 2012. The multiplying coyote population became a big problem a few years ago in western Marin county, where they were killing sheep and calves, then ranchers began buying sheperd dogs, including Great Pyrenees and Anatolians. The dogs seem to have completely controlled the problem. Photo: Michael Macor, The Chronicle
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