My dog also does a good job protecting against hawks. When one flies over she barks and stays in the area it is over refusing to let it land. A heron was brave enough to land on the other side of the pond one day and she went running over scaring it off as soon as it landed.
X2
We've got our fair share of hawks around where we live but they don't come anywhere near my property. We have a big chicken-friendly Golden Retriever that keeps 'em safe.