My dog does deter them. Hawks flat out will not go after my birds with him present. It would suicide. Not all dogs are on their toes, expecially when in pet mode all the time.
My dog is too old. She just sleeps all day.
The young dog I have would deter them, but she would be a bigger threat to my ducks than the hawk. (still in training.) lol.
I'm glad yours deters them. Hawks are beautiful creatures.. but I'd rather them stop circling my poultry.