The best way you can keep predators out other than a dog is to enclose an area. YOU can make the area as big as you want, but we dug a trench a few inches deep anywhere we were going to sink the chicken wire into the ground. Then, we put rocks of good size (6" or larger) around the whole perimeter inside AND outside. That made it really difficult for predators who like to dig. We built a 1 x 2 frame that was quite wide and quite long, and on the top we double-layered chicken wire fencing, which we clipped sections of in various places all over the top pieces and twisted together to form our own "barbed wire" effect. Hawks and owls grabbed it and lost feathers but were not seriously injured, but severely deterred from trying again to get into the pen from the top. We never lost a single chicken, in fact, the man who sold us ours, (we were supposed to get 18 instead of twelve, but he decided to keep the rest) said he should have just given us all the chickens we were supposed to have gotten, because his were killed by predators, and our coop and run/play areas were like Fort Knox. LOL. Plus, the people who have spoken above are right, chickens once they are used to their coop area, generally come to it at night with no issues, providing you have kept them there long enough at the beginning. And it is good to let them free range for a while during the day, you will notice a HUGE drop in any bug issues, including ticks and mosquitoes!