I operate based on first hand experience. Others likely harvest off the internet.
Look back at previous years linked in the most recent thread.
https://www.backyardchickens.com/threads/great-horned-owl-fun-in-2020.1344059/#post-22072091
I have very good owl control, yet have owls. I see and...
Dog you have a dog?
If chickens missing more than about 3 lbs you can find them somewhere nearby with a little looking. If not, then owl has help. I have had owl and fox come in on same night more than once.