Dangerous Owners

How many times do you hear about someone being attacked/maimed/killed by a dangerous dog? And how often do attacks by other sorts of dog with completely irresponsible owners get reported? Not often, exactly as I thought. Now there's a world of difference between finding some villain's fighting pit bull attached to your leg and trying its damnedest to bite it in half and Mrs Terrible's prize yorkie, Wilberforce, nipping your ankles.
On the one hand the pit bull is a Dangerous Dog because it has been trained to do what it is doing (even if you're not particularly keen on it doing it) by Mr Knuckles and on the other Mrs Terrible is a Dangerous Owner because she will insist that Wilberforce is only snapping at you because you looked at him in a funny way and ignore the fact that she has completely failed to train the vile beast and isn't it cute the way it shits all over the pavement - which incidentally is the Council's fault in some way, presumable for not picking her up by the scruff of her neck and rubbing her face in it.
You have to have a license to have a pet leopard - and when was the last time there was news that someone's leopard had eaten the postman? So there you are, licence the dogs and the problem goes away.