You should check out the Predator Identifier Tool on PoultryDVM. It is pretty cool, and has helped me narrow down an unfortunate attack I had on my coop a couple months ago Not a fan of the weasel..
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This was most definitely a domestic dog. Coyotes do not kill that way.
It's most likely a domestic dog, but there isn't a mammalian predator out there that doesn't spree kill at times (especially when young are involved). Foxes will often kill a couple of birds and then drag them back to the den one at a time. All it takes is something interrupting them for a whole bunch of dead birds to be let laying around.