Guinea hen got killed :-( -What could have done it?graphic pics

I went out to put the chickens in for the night and when I was counting I noticed we were missing the lavender guinea hen, figured maybe she was on the roof or in the tree or maybe in the barn. I'm looking all around and she's no where to be seen, I called Chrissy(my moms friend who fed and let them out this morning) to see if she had seen her(even tho I counted when I put them in last night) and just as she picked up I spotted her along the fence line .
From looking at the pics does anyone have any idea what could have gotten her?
Chrissy was on her way to pick up my mom from her trip(she was away all week and I took care of the chickens every day but last sunday morning and this morning since I didn't have to work so I wouldn't be over that way). Chrissy had the coop door wrong(we have to keep the horses from getting in) and she door had closed so they couldn't get in. The horses seemed out of sorts when I got there, they all came galloping up to the fence which isn't like them.
The worst part was picking up the body and bagging it. I was a vet tech for 4 years so that kind of stuff usually doesn't bother me, but it was really rough with the guinea hen.

"Eww."-My boyfriend

Anyways, could it have been a dog? I don't think a cat could've done that, but I've seen my mom's dogs kill woodchucks and it would kind of end up looking that =/

Likely a domestic dog. A coyote or something wild would have most likely actually taken it and eaten it, not just killed it for fun like that. So sorry that happened!

My moms dogs have an e-fence so they can't get back in the pasture and there really aren't any lose dogs around. My moms appy is also very territorially and will chase anything that comes into the pasture. The way the fence is only something fairly small could have gotten under it. I don't think it could have walked through the pasture without Legacy seeing it and chasing it out. I'm thinking something killed it and then Legacy chased it out before it could take the body or eat the rest of her. It happened during the day time tho so unless it was something rabid it greatly limits the suspects. I was thinking fox, but again daylight.

Hawk or owl.
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If it's missing its head, my guess would be raccoon, they're notorious for pulling off the head.

it's not, it was just curled around funny under it's back, I thought it was until I picked it up

A domestic dog is the only thing I can think of that would kill just to kill. Cats will usually eat the organs (my cats favorite are the brains and eyes).

Fox or coyote would have taken the carcass, but often raccoons will take just the choice stuff and leave the rest. Sometimes it is the head, other times the insides.
Was it evicerated?
Weasels, opossum, hawks, and owls can also take birds and eat the choice parts as well, specially if it didn't get inside the coop and tried to roost in a nearby tree, which Guineas are famous for.
Sorry it happened.