Shep, I've only just seen this.
to you for having to go through such a traumatic experience. And
again for taking the time and trouble to get the sheep sorted.
I have to believe that the owner was unaware of what the dog had done - maybe, like one of the posters on here, didn't know there were sheep on the moor, dog wasn't about for a bit and then was... sounds like there would have been blood on the dog, but what could you do? It's a big moor to go searching... So I do hope the owner didn't know about this specific sheep and hopefully will have learned a lesson from the state of the dog on its return.
Plantoid's story is horrific but not terribly uncommon. A vet friend of mine always says, "One's a pet, two's a pack." They'll get up to things together neither would on their own. A policeman in a sheep-farming area once, many years ago, told me that the majority of sheep attacks were carried out by farmers' dogs. They do things to sheep when their owner isn't about, he said... These days, I think, traffic is so much more dangerous that most dogs, farm or otherwise, are safely contained most of the time and rarely wandering unattended.