That is really weird.  I can't think of any predator in Ohio that would attack a goat that way.  Aren't they a little big for weasels?  I can't visualize how big they'd be, but a weasel or mink attack does fit. from what I've heard, too.  But, we had a weasel in with our chickens once; he didn't drink the blood, but gutted the bird, left all the good meat. There were no pinhole bites but I've heard they can do that. It's scary, cause my DH told me he watched a show on TV last week where they were talking about mystery attacks on cows; they were finding cows lying in the fields, supposedly, with certain organs removed as if they'd been surgically removed; they were blaming it on UFO',s as it was happening all over the world, supposedly, and the American farmers were blaming the US government for trying to cover something up.  Who knows how much truth there is to all that, and I didn't see the show, but that's what it reminds me of.