The Trailing of the Sheep Festival is happening through Sunday in Sun Valley. The popular fall festival features a variety of events, including the Sheepdog Trials.

"The Sheepdog Trials are trying to duplicate what natural working conditions would be on a farm or a ranch," Sandra Milberg, a longtime handler from Santa Rosa, California, said. "Our dogs are bred for herding.”

Check out the video to see the border collies herd the sheep — The Sheep Dog Trials area sight to see at the Trailing of the Sheep Festival

Border collies herding sheep dates back 200 to 300 years, when the Scots used the dogs for silent gatherings across the English borderlands.

"There is an old story that the English weren't very nice to the Scottish," Milberg said. "So, the Scottish people would come into th

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