Still no word from the dog owners, but I am sure once I send a recorded delivery letter to their house outlining the costs, I'll get a response.
On top of the damage to the ewe, the other pregnant ewe gave birth (I think a week or so early) in the middle of the night. We found the lamb suffering from hypothermia first thing. Fortunately, we managed to warm her up, get some feed into her and returned her to her mum, but it seemed touch and go for about 8 hours.
There are some pictures of my calm greyhound Amy laying next to the lamb warming it up.
The bitten ewe doesn't seem to bad, still eating well and feeding her tubby twins.
I think it was lucky it happened as I was getting home and not in the middle of the night or both out at work.