Hi! We're going to have a very small flock of chickens in the city. We have a little property about 2/3 of an acre. I see pictures of chickens running around all over and I'm just wondering how you keep them from running away or from a dog snatching them or a cat? A feral cat out here can and always does, take down giant crows.... I think she would definitely attack a chicken... Anyway, I'm just trying to figure it all out. Can someone fill me in? Thanks!