I get that you're trying to be humorous, but I'm surprised anyone on this board would even suggest something like that. I don't have any interest in killing the dog; I just want its owner to establish firm control/leash it when outdoors.
I definitely intend to speak with him about it when/if the opportunity arises, and I figure I'll try to frame it as looking out for the dog's well being in terms of if it bites the little old lady two garages down from me, she won't be able to defend herself and the dog would likely be destroyed by the authorities at that point. The problem is that he's the boyfriend/baby daddy of the daughter of the person who owns the unit in question, so it's a bit of a weird situation.
Interesting. Not sure if I'm willing to carry one more thing, as I only have so many pockets, but especially in the biking context, I can see the utility.
Yeah, I figure it probably was just barking, but for the few seconds it was running at me and barking, it seemed like more than that, and it served as a bit of a "what if" wakeup call for me.