I wasn't being at all unreasonable to give the dog owner a row, was I? Not my field, not my sheep (or lambs) but the bloody idiot was using his dog to play at sheepherding or something. Yes, it was a well trained dog, but it obviously was neither a sheepdog nor he a farmer, and the ewes and lambs were terrified and trapped in one corner of the field while he messed around with whatever silly game he was playing to brighten up his evening.
I got a load of abuse back from him, but he and the dog did leave and drive off (I have his registration number). Not even sure who the sheep belong to, but they are near where I live.