Our girls have two labs to protect them. We also have chicken-eating cows next door, so the dogs do a perimeter check every hour or two and give the cows an earfull if they're too close. We've only had problems with predators in our yard when the dogs were not around, so we leave them outside as much as we can while the girls are free-ranging. The chickens share their treats with the dogs (although not always willingly), and occasionally one will hop onto a dog's back for a ride.