We were driving from Fairfield, Idaho back to Hailey a couple of months ago when we were stopped. We were stopped by a dog laying down in the middle of the road, facing our car. Then the cattle were moved across the highway (2 lane, US20) by cowboys on horseback and one in an ATV. When the cows were safely across, and they were reluctant to go, the dog in front of us and a partner blocking traffic on the other side of the crossing got up and ran to catch up with the herd.