One advantage of such a system is that done properly, you then have a local data base of problems - not just for dogs, BTW, but for bad intersections, cars with H8 BKRS plates, etc.

After all, one call to authorities about, say, a loose dog, can easily get met with a yawn. A consistent documented pattern of "undesireable behavior", however, gets official attention.

No, I'm not the person to set such a thing up, bike clubs are well placed for such an effort, though.