I've been on both sides of a dog problem. Our German shepherd whom we had had from a puppy, grew up with our horses, sheep chickens and ducks, never a problem. One day she got onto our field aged 10 and attacked our sheep, fortunately they were ok, a few bite wounds but lived! It was a one off that we didn't understand, thinking maybe a fox had got into the field and she went after it we gave her the benefit of the doubt. A week later she jumped up and bit a guy doing some work here, not a nip a proper bite, it was agonising as we loved her so much, but something had changed in her and we did the responsible thing and had her put down. I spoke to animal behaviourists, the vet and family, we decided to keep her locked up would be cruel after living here free range, rehoming would simply pass on the problem, we made the right decision.
A couple of years later our next door neighbours got an ex breeding bitch, German shepherd, it's nuts! It's gone for all of us, we secured our fencing to keep it out of our property, but we share a lane of which they seem to forget is our right of way to get to our house, one day it pinned my then 10 year old son to the fence and bit him, they witnessed it, we called the police, they refused to have to dog pts or rehomed, so a neighbourhood agreement was drawn up to say they would keep the dogs secure 24/7,
The dogs continued to escape until they finally took responsibility for them. Lately he's got relaxed with it and now walks them off the lead ( he cannot control them on the lead, his own admission) to and from his house along our lane, so yesterday we called the police again, we should have the right to use use our right of way without fear of his dogs, but they just don't get it!
If the dog worries my sheep I can shoot it, bites my son and nothing's sone, it's ridiculous. People forget dogs are animals not humans, and should be treated as such, a responsible dog owner is someone who keeps their dogs under control at all times, no exceptions!
Having a dog pts after the event is always an option, if the dogs done it once it will do it again, I could not have that on my conscience.
If It had been someone else's sheep our dog attacked I would have had her pts sleep that day.