I have messed with Great-horned Owls a bit. Species is important so do not leave it out of discussion. Owls can be defeated by chicken wire and deer netting where the latter would appear far to flimsy. Key to such lighter materials being effective is that chickens must not be roosting close enough got owl to reach through with feet or beak.
Scaring them off is tough. Close calls with a dog trying to grab them off perch does work but their are issues of practicality and legality with that. Flashlites do not work nor do the predator dummies. My owls generally are not going after the chickens as the preferred target. They are usually in after rodents or rabbits but will go after an easy chicken.
My approach is to confine chickens at dusk and monitor periodically with spot light for owl activity. Once owl visits cease I get a little lax until owl comes back which may not be for months of even years. I first notice owl trouble by loosing a chicken. Owl kills are easy to ID. Carcass is left in place for a couple nights as I get chickens into more protected roosting quarters. Removing carcass before flock protected can result in more losses than would be realized otherwise.
Scaring them off is tough. Close calls with a dog trying to grab them off perch does work but their are issues of practicality and legality with that. Flashlites do not work nor do the predator dummies. My owls generally are not going after the chickens as the preferred target. They are usually in after rodents or rabbits but will go after an easy chicken.
My approach is to confine chickens at dusk and monitor periodically with spot light for owl activity. Once owl visits cease I get a little lax until owl comes back which may not be for months of even years. I first notice owl trouble by loosing a chicken. Owl kills are easy to ID. Carcass is left in place for a couple nights as I get chickens into more protected roosting quarters. Removing carcass before flock protected can result in more losses than would be realized otherwise.