And here's what happens:
How to stop it:
Well, you can't. But you can try.
Every dog owner at registration gets a leaflet on the law.
At every vet visit the vet has to give the same leaflet.
At every caravan park, camp ground and holiday letting, the agent or owner must also give the leaflet to any dog owners.
That's a start.
Of course, the best way is for non-dog handlers to carry a rifle, and use it as necessary for the suppression of dogs of leash.
That's the fun way.