Buy a Ridgeback! mine does a good job... :-)
Back in the 70's (before the laws changed ) a friend of mine ran a garage. I was there one day when a local businessman came in to pay his account with a female lion on a lead!
I can imagine his house with a sign saying "trespassers will be eaten"
I would like to see one today's chav's with a staffy fashion accessory intimidate him.