I'm in a fairly developed section of Gainesville Florida, and over the years I've had trouble with raccoons, possums, bobcat, coyotes, great horned owls, and hawks. I now have battery operated alarm sensors, they sell for about $10 on sale at Harbor Freight, that go off when an animal comes snooping around the coop at night. In the last 10 months I've shot some five racoons and a couple large possums (I let the small ones go) that my dog has treed, I let him out when the alarm goes off. And of course I latch the doors to the coop at night fall (they are allowed to roam my seven acres during the day..) The coyotes have been brazen enough come hunting chickens during the middle of the day, and I finally shot a female when she came around the corner chasing a hen. They haven't been back, but they will... Always something out to eat your chickens!