Something that would further inconvenience the owners would be good, I would think. This might be a good way to do it without making yourself feel bad. Dogs are safe. You are safe. Your animals are safe.Are they agressive towards you when you've seen them? The dogs, i mean. If not, I'd stake them somewhere they won't get in trouble until they can be retrieved or take them to the shelter and let them know who they belong to and whats going on