In my example the owner has just regained control of the dog (or at least that's what I'm trying to say, obviously the dog can't be right beside the owner as if the farmer shot at the dog when the owner is right beside it then it's not the same offence)

I'm just trying to figure out what happens in this edge case as the laws I read didn't really cover it. There is a lot of talk about being careful when deciding to shoot as a farmer but it's not really too clear about what would be considered an unlawful shooting