Both of my flocks have grown quite comfortable around our german shepherds since the dogs ignore the chickens and don't threaten them in any way. However, due to the fact that I free range, I would like for the chickens to retain their instinctive fear of dogs. Stray dogs are rare here, but they do happen. Our dogs have to go out during the time the chickens are out, so there's no way to keep the two species completely seperate. I take the dogs out on a leash, but they walk around amongst the chickens and one of the chickens is quite curious about the dogs and comes running up to them. So is it the shape, smell and size of a dog that causes chickens fear or is it the dogs actions - running/chasing, barking, etc. that cause the fear?