Also. You chose to get the chickens. That means you chose to be their provider! Chickens cannot really defend themselves so you have to.
It's the same with all livestock
We have a 1/2 Pyrenees 1/4 Border Collie 1/4 Australian Shepard. She's kept everything away since I got her. I still set traps though, catch some coons and skunks.
I'm thinking of buying a full blooded LGD now. If I can manage to spend $200 on one since the one I have now was free