My dog attacked a complete stranger on the street out of the blue

2 months ago I wrote a post on this sub with the Title “Adopt don’t shop is not all flowers as it sounds”. I got many responses (much more then I expected!) and some hate.

2 months after that post and I am glad to say we made so much progress! The barking, the shedding, it is so much better with good nutrition. They spend 1 week with the trainer (like, 1 full week in his facility), I crate trained them and they are sleeping each one on their crate, they already know “sit” and other basic commands.

That post was more a venting post but now I search for help

Today, when I was walking my dogs,my boy was peeing and I was waiting for a second by his side, with the leash of his mom on my other hand, when a young lady walked by our side and OUT OF THE BLUE, WITHOUT ANY WARNIG (barking, showing teeth, anything), my girl attacked her, and grabbed her pants (it was like a pantalon, so like big legs, and she was not hurt). Thank god I held her leash tight, the girl was not injured or upset and just continued her walking. She never did this on leash. She did bite my grandmother, my mother (bite strong enough to leave bruises), a friend, the vet, the trainer, and snapped at my maid and a lady who works on our condo, but never on the leash walking, just on our house or when the person interacted with her or her son. Always looking for the foot/ the heel. I am afraid of walking the two of them alone right now, and will buy them a muzzle. But I am upset because i am not sure if this aggressiveness is something I can overcome or rehabilitate completely. It happens all in a fraction of seconds. During the rest of the time, they are sweet as possibles with me and my husband.

Did anybody here overcame these obstacles and now has a dog that can safely go anywhere with them?

Some context: - I adopted 2 dogs 3 months ago. They are mother and son and the shelter wanted them to be adopted together - they said the son was never separated from his mom when he was a puppy and they grew attached on the shelter; they once spend a week separated (when a family was interested in him) and he did not eat, and was returned. That is what I have been told. - They did not told me about bite history. After the first incident, I asked them directly and they say they sometimes barked at strangers. - I am not from the USA or Europe. I am from Brazil. The dogs are not “mix” of anything, they are street dogs, complete mutts. The shelter policy here is totally different from what I observed - actually, they spend a year on a Puppy Hotel/Puppy day Care prior to the adoption (not a shelter exactly) - The culture around training dogs here is also very different. Neutering became normalized only a decade ago; there are almost no crates ava ilable to shopping; there are many dogs that walk free on the streets during the day but have homes or are “community dogs”. There are still people who have dogs who stay on the backyard leashed all the time. So my resources are more scarce in terms of good trainers etc. Also never saw anything like Behavioral euthanasia here talked openly; I guess the biting is not seen as something so serious like other places (I saw people saying that dogs with bite history should not be put to adoption, for example, in other countries) - even muzzles are not as easy to find -They are each 6/7kgs (13/15lbs for those who don’t use the international metric system)