Has anyone ever had any experience with a hen going after puppies? I have a puppy pen that the puppies can't get out of, but the chickens are able to get in and out of. One of my hens just started getting on top of one of the puppies, flapping it's wings and making the puppy cry. I can't tell if she's just scaring him or actually attacking him - luckily I haven't found an actual injury on the pup. What might have prompted this behavior and how can I get her to stop??