I can't imagine wanting to have an agressive dog around these days. Everyone is so sue happy, all it takes is one nip and you get sued, even on your own property, even if the person was not supposed to be on the property.
I had a friend who's dog bit an intruder and the intruder sued the dog owner and WON.....
I work for a vet, train and show dog professionally and agressive dogs of any breed, whether big or small are dangerous. I have had little dogs bite me, but the worse are the big dogs that have to come in triple muzzled, growling and snarling. The owners excuse is" he loves our family" so we love him.
I love hearing " my dog is protective of me" and then it will bite and growl and attack other people in the family, other dogs or animals.
My daughter's horse was attacked by the neighbors pitbull mixes in her own yard, she has finally healed, but it took along time. The owners of the dogs did nothing.
I am very opinionated about biting dogs, for any reason, unless they are police dogs. As far as I am concerned, no dog should bite a human being for any reason, ever. A dog can sufficiently bark to warn off a threat, but the average homeowner should not own aggressive dogs, somebody someday will get bit or attacked. Hopefully not a child.
And yes, I have put down aggressive dogs and have suggested it to people who own aggressive dogs.