Not all cats are the same but for me they are much less inclined to go after chicks, especially if hen or aggressive rooster present. If cat appears to direct unwanted attention towards chicks, then release hen so she can flog threatening cat. Such flogged cats learn very quickly, more so than dogs under similar conditions. I have several hen and chick units like Den and Penn posted plus four cats and two dogs. Chick welfare is vary good with only concern being with cocciodosis when ground is consistently wet.