In Spain there supposedly are regulations for these dogs. They came into force after several attacks like the one you mentioned. But what's the use? You can still see the owners walking them as if nothing happened. Few of them have shortened their leases. And if a child passes by and looks scared, the owner will just laugh at it.

But I do have to say though, it's not the dogs, at least not largely, but the owners who are at fault for these things.