I have a black Japanese and a mille fleur. They have never fought before. They have free range of over 2 acres and 7 hens, which I know is below the 10:1 ratio but like I said, they've always been friendly to each other. About a week ago a fox stirred a few of my neighbors hens into my yard and I seimultaneously gave away two roosters, keeping the two I have now. All the sudden today the two Roos start chasing and fighting each other. The mille fleur was even chased out of my yard. He has never once before been out of the yard and was bleeding more than just a scratch'a worth. I'd hate to lock either of them up and can't do anything about the number of girls but I don't like them fighting. Am I doing something to stress them out? Can I lower their hostility towards each other? Is this just a temporary thing to determine dominance?