Let them out for an hour at a time, when you can be out there with them. Keep your hand on the hose and spray the cat the minute it comes into the yard. It will learn. My cat is a good hunter too, but he has learned to NOT stalk the birds. So, he'll hang out amongst them (and they will SQUAK all day long!) but he'll leave them alone. He's learned the wrath of my peahen, so he knows about the beak. heh heh.Any suggestions on how to free-range my chickens with a neighbor's cat that's used to running free? I finally discovered what the huge problem was all morning - our neighbor's cat has discovered them and is hanging around. It was bad enough with the stray (that I still haven't caught) - now I have to deal with a loved domestic cat. I talked to the neighbor, they gave me permission to spray their cat with a hose, but, I'll be honest - I'm nervous to let them out of the coop now. They told me he was a "good hunter" and that he's used to being out wherever he wants.