^^ Didn't the guy who owned them want to use them for fighting? Large and heavily defensive dogs passed around from inexperienced owner to inexperienced owner is an accident waiting to happen. I vaguely remember those posts, but Alex had a few questionable dogs and had a few ... um, unusual training methods. "Rage" as you're describing it here is pretty rare and could easily be confused with a dog with an extreme reactive temperament. Such a dog cornered in a hallway fighting an adversary while an owner bangs on it is going to go deeper into his comfort zone - defense.
A point-by-point rundown of the case. I saw another RS Presa a few years ago at Donovan's. Great looking dog but seriously weak nerves covered up with a strong bluster. I believe he was put down when he bit the owners son. Side note: speaking of Vyatkin, years ago I taught a young kid a few decoy moves and training methods at a dog show. I forgot all about it but just found out that he now lives with Vyatkin's ex. Small world. leftyJean Donaldson, director of the behavior and training department at the San Francisco SPCA. "The likelihood is that people see signs and ignore them," Donaldson said. "Usually, there are small signs all along. You cook up the right circumstances and a lot of dogs are capable of doing this type of thing."