What if the flock was protected by a pack of large herding dogs, like German Shepards?
Edit: Apparently guardian dogs defend from wolves. Herding is a different job. See https://en.wikipedia.org/wiki/Livestock_guardian_dog.
https://youtu.be/x4eImh13-ow?t=1072
It appears to be a Georgian documentary, and they describe a Caucasian sheepdog as being larger and stronger than the local wolves.
When I try to Google this topic, I'm mainly getting junk about some speech from American Sniper.
It also looks like the dogs have to stick to the right tactics and have limitations. The dogs stay put in defensive positions and defend the flock as a pack. They'll kill a wolf that gets too close, but they usually just chase them away. They can't chase too far or go out individually or they risk being killed by wolves. They're also more effective when the weather is such that they can use their sense of smell.
Edit: I posted this upthread, but apparently guardian dog is the term for dogs defend against predators (but they do not control its movement), herding dogs control the movement of a herd (but do not typically defend it well).
Edit this is interesting: https://www.facebook.com/notes/cinco-deseos-ranch-livestock-...
https://en.wikipedia.org/wiki/Boerboel
My old neighbor had one, and prior to meeting him I had heard from others the he owned a 'bear'. One of the biggest dogs I've ever seen, and all muscle.
I've seen one pick up a coyote with it's mouth and break its neck, they are crazy territorial and mean.