Our backyard is occasionally visited by feral cats. I do not kill or injure cats, but I keep a loaded .22 LR rifle by the back door. When I see one that is inspecting the layout of the chicken pens, possibly planning a stealthy nocturnal penetration, I open the door a crack, quietly, and plant a high-velocity round in the ground at no more than a foot from the little marauder. The next time it's going to be a different cat, because rarely do I see a cat return to my backyard after this treatment. Now, the live trap I use does not have such a profound effect on cats as a deterrent, I think. After catching the same cats two or three times in it I figured that for them spending the night in the trap is a very small price to pay for the bait they have consumed. Yes, they seem upset when I find them in the morning, and run like heck as soon as I open the trap door, but they return. That supersonic CRACK! and the dirt that mysteriously shoots up in the air and pelts them seem to do a job on their feline psyche. But I am not worried about cats. What worries me is that I found feral hog scat close to the pens. To a large hog the chicken netting is a joke. I don't know if one would be able to dig under the side of a chicken house (the houses sit on bare dirt) but I am sure if one wanted into the run it certainly could, leaving a big messy hole I'd have to repair before I can let the chickens out. I have bought some sturdy hog snares, but I haven't set them yet. Here in Alabama hogs are a problem. Fortunately from this year on the legislature has allowed us to hunt deer and hogs over bait. I am looking forward to nailing some sows and piglets while I am hunting deer. Boars are inedible, here, for some reason. I tried butchering one. My wife literally puked while assisting me. The stink was unbearable. And the meat was also disgusting. Coyote and buzzard food.