I am very new to chickens. I have 4 about 11 week old Buff Orps. I love my girls. They love to come out and free-range in our yard. Since my dogs are trained to not even look at my parrots I began letting the dogs out while the chickens were out. My extremely fluffy sheltie will be laying in the sun and Faith, my bossy little chickie will run up and pluck his hair out. So Bentley (Sheltie) will start running away from her and then the whole flock begins chasing him. It is hysterical!! Is this really odd?