The only problem I've had has been with coyotes. My chickens are securely locked in at night, but I let them roam around the backyard with my dogs during the day. I lost four chickens at dusk before they went in but I didn't know what did it, and then a few days later, a coyote jumped the fence and killed three in broad daylight with my three dogs including my couch lab (lazy dog) in the backyard cowering in terror. My husband chased it off, got the dogs in the house, tied a couple of the chickens in the tree, and waited inside at the bedroom window. The stupid thing was back within 10 minutes trying to get them out of the tree when the problem got solved. At one time I felt kind of sorry for coyotes, but no more! There are at least a million cottontail rabbits in the front yard -- why not them instead of my chickens !!!