would you be willing to own a dog-aggressive dog?
would you adopt a dog already known to be dog-aggressive?
what would you do if your own formerly unaggressive dog became dog-aggressive?
what would you do if your dog attacked another dog while your dog was off-leash in a public place?
Agreeing with some others, WOW!!!!
Would I willingly own a DA dog? Absolutely - because I have, and currently do.
Would I adopt one known to be? I wouldn't go out seeking one, and because I have a multi-dog household, getting along with the other dogs and animals (cats, caged pets) in the house is the priority. If the dog got along with them, but not other dogs, I would be fine with this.
If my dog suddenly became aggressive, I'd have to reevaluate. Was it really suddenly, or did I miss warnings? Do a full physical, rule out medical reasons. And then train and manage, manage manage.
If my dogs caused damage in public, I would take responsibility.
Now, I'm living with 3 dogs who to some degree, have aggression issues. My 13 year old male came into the house almost a year and a half ago with no issues with my own younger male, but he will and has gone after other dogs - he adores Rah and Berlin, but barely tolerates Mercury and that's as far as his circle goes. I didn't seek him out - and by some miracle, he adores his "brother and sister" - but other dogs are a no no for him.
Hell, I've got three males here - the male-male aggression is written in the breed standard, it's cautioned against everywhere. I already manage them and crate/rotate (or some variant of). Just yesterday, Mercury and Tyler almost got into it when they were accidentally left in the same room together for a few seconds because Mercury slipped through a gate.
Mercury will not tolerate another strange dog coming in his face, and he will react to that. At the same time, the dog can go to shows, the dog has titles, the dog can work off leash, has great attention - but if a dog invades his personal space, he will not tolerate it. He completely ignores all dogs otherwise.
Rah is happy go lucky and does incredibly well for a male - but he is very territorial and will not allow strange dogs in his yard, his house, or around things he considers "his" - and he will not start a fight, but he will certainly respond to one, especially from intact males.
And if my dogs were somehow too aggressive to compete in the sports I like to compete in, then oh well - I love them more than the sport, I can deal with it. I like my multi-dog household and strive to maintain it as peacefully as possible. Do I want DA dogs, do I want multiple males that I cannot leave together, that cannot run together, etc? Nope - but that's what I have right now, so we deal.