I have to say I would rather shoot the owner
The thing that really gets my goat is when the owner says"He's only playing, he's very gentle with the grandchildren" Happily for you, say I, your grandchildren haven't got four legs and a fleece!!
ANY dog will chase sheep,my tiny Yorkie who can walk through the mesh of the sheep netting thought he might have a go. The ram made him think again!
The other dogs know that it's more than their lives are worth to even look at the sheep but I will bet a years wages that if they were in alone with them and the sheep ran they would chase them and instinct would take over.
I had two ewes and two ewe lambs killed last summer, poor little buggers were defenceless (that was a dog who was "playing"