I hate to pay any attention to such obvious nonsense, but sometimes it’s worthwhile to call out fearmongering BS. Coyotes are taking down healthy adult horses? EIGHT HORSES? You might as well complain about an alien abduction along with crop circles in your field for all that I’m going to believe you. In fact, in this case it’s about just as likely that aliens did it.
I would get into more expository detail if it weren’t for the absolute absurdity of this claim. Even wolves, being larger, wouldn’t make a good culprit because that’s not what wolves or coyotes DO. My skepticism here should be understandable.