That's always the issue, Perazzi....the "there are no bad dogs, just bad owners" outlook.
It doesn't matter that the dog is or isn't properly trained when it comes down to being bit because a dog running was running loose, or not responding to it's owner's commands. The dog isn't responsible for it's actions; it's a dog. It can't be held accountable, so all the responsibility and accountability falls back on the owner. And since there are no laws that require a pet owner to properly train their dogs (at least nowhere I've ever lived), the only laws that offer any semblance of safety to the general public are laws that force the owners to physically restrain their dogs so they can't wander loose, either through leash laws or laws that require physical barriers to keep the dogs confined to the owner's property.
I firmly believe that, in a situation like the OP described, and absent any other criminal penalties, the owner of that dog should be compelled to purchase dog liability insurance against any future dog attacks, and should be compelled to attend special dog training. They should treat people who let their dogs run loose and attack people the same way they treat people who carelessly store or handle firearms that result in other people being injured.
You sound like a very responsible dog owner, Perazzi. If all of them had your outlook, then this would be a rare issue. Sadly, it's not...just recently in the area I live, a 64 year old woman who was out for a walk was attacked and killed by a couple pit bulls that were running loose.
"No matter where you go, there you are."