This is the second time this has happened recently. I see the chickens run for cover and then the dogs, A Great Pyrnese and an Aussie, take off running in hot persuit of a hawk. Today I had just brought in the Faverolles who were free ranging and had gone to get fresh water. The Hawk just lifted off the ground and the dogs chased it till is was not longer around our acreage. I quickly did a head count and everyone was safely under some sort of cover. When I first got chickens my Aussie was curious and wanted to help herd them. She is a smart girl and accepted the fact that she was not to bother the chickens but I let her chase the crow off. Somehow she does know the difference between her chickens and crows and hawks. The Great Pyr, just naturally barks and chases anything that moves around here. I am so lucky that I have not had one try to get inside my pens. I have 4 pens and a large fenced chicken yard. All are long and narrow. It may be that they don't feel comfortable around the dogs or they don't have enough room to maneuver in the narrow space. Since this has happened twice recently I am going to string wire over the top and attach streamers. I did that the first year but have not had problems again. I think its time to be defensive again.