Small varmints do take internal organs, eyes, a$$holes and can leave the dried hide almost hollow. I remember seeing possums run out of the body of a dead cow. Not all cattle that die in the pasture (for whatever reason) are torn to shreds and dragged around, some are but not all.
Well, that's one possible explanation for the phenomenon, but how do you explain ranchers finding these carcasses within hours of their being mutilated, and finding no blood or animal tracks around them?
These guys know their business, and many of them have described these cattle mutilations as being uniquely odd and inexplicable to them. I've heard the interviews. These ranchers are genuinely perplexed by what they've found.