So I had 4 6 week old chicks I had in a dog cage in the coop with my 8 13 week old chickens. A few days ago I removed the cage and they seem ok. They would chase them a little bit but nothing I was worried about. Then today I go out and they killed one of the 6 week old chicks. It was outside the coop in the run and was half plucked. Any suggestions on what I can do to prevent this again. I have put the 3 back in the dog cage.