It is not the dogs fault. The owner should be held accountable. Being the dogs have a collar, I would check and see if there was a tag on it. If so the owner
And I would have a talk. If no tag , I would not kill the dogs but I might pick up limb and beat the hell out of them. I always think that these might be some kids Dogs
And I try to think about that. Hopefully you can find another outcome rather than killing them.