I have a 100'x100' chicken yard. That's 10,000 square feet. The fence is 4' high with 2"x4" weave. In addition to the chicken house I have a dog house. That's where a good ole mixed hound rescue dog lives when not by the woodstove. He will not harm a chicken or a cat. I also am surrounded by hawks, foxes, neighbor dogs, bobcats, and about anything else that lives in the woods and fields. The only time I ever loose a chicken is if one gets in the habit of flying outside the fence to forage (which is pretty rare). Anyway, I just have to say, if you can find a good dog like Cleo, you won't have problems with critters. Although as gentle and loving as they come, he is the great enemy of all things wild and fury. I love this dog. He is worth every penny I will ever spend on him.