Earlier quoted context omitted.
Which is why you have dogs to protect your livestock. I think people forget that man's best friend became that way by doing jobs for us. Want your cattle and chickens protected from wolves, fox, eagles, etc? Train some dogs to protect them.
Are you actually aware of dogs protecting free-range chickens against bald eagles? I am not sure that bald eagles really care about dogs. A bald eagle will swoop down and snatch a chicken or even two and fly away without even landing. That being said I think an even very loose "netting" that can consist of simply rope criss-crossing with certain gaps can sufficiently dissuade eagles and even other prey birds.
I've even heard of people using guardian geese instead of dogs. They're supposed to be very effective at preventing arial predation and orders of magnitude cheaper than dogs, though I've never heard anyone talk about them in the context of something the size of a bald eagle.