My mother is a sweet gentle soul and animal lover. She got a presa as a guard dog and after extensive training recognized in it the heart of a natural born cold as ice killer. She shot the thing and buried it and told anyone who asked that it ran away.
If she hadn't she might have ended up like this gal.
Some dogs are just killers - especially ones bred to BE killers.
With the combination she had, it’s not a surprise. Just consider that one of the dogs has an aggression for other dogs and she tried to stop a fight. I have tons of experience with lots of working type dogs, I did bitework with one last night.
You should be smart enough to realize that when one of these dogs ends up as an adoption, odds are if it’s a shepherd, dobe, presa, pit bull, rotty, it is there because it has bitten someone. That’s just a fact of life. Mixing four of them together is just ignorance IMO. I have no use for a truly aggressive dog, you are way better off to have a trained dog that will hit on command if needed because you are the one making the decisions. That’s also why you don’t hear the horror stories about malinois, dutch shepherds, working german shepherds, because they are taught to be social, and that the handler makes the decisions. They will bite and take someone down, but are really in their mind playing a game when they do it, some of these others are not that way.