I can't free range where I live now becasue of dogs. I plan to build a large pasture for them with 5 foot wire fencing. This will keep them away from dogs and most day time predators. I lock mine indoors at dusk so I don't have to worry about anything at night. I have decent sized runs now but they would really like to get out on grass so thats why I'm building the fence. I would free range if I could but I would have to deal with heavy losses from the dog. Hawks really aren't too much of a problem if your hens have hiding places. They usually keep a pretty good eye on the sky and run for cover if needed. A few shrubs or plywood A-frames will work well. Keeping a rooster or two is really helpful. Mine have saved my hens countless times. The roosters usually keep a better eye on things and they usually run after predators which gives the hens time to escape. Pasturing poultry is a really good option. You can even by electric poultry netting so you can move the fence as needed to offer them fresh grass.