It's likely that V. got in trouble again somehow. He gets high and/or drunk and belligerent and I know he's not supposed to be at his parents' house, which is around the corner. I think he's fought the police before too. He's a big burly guy, worked as a meat cutter, and I wouldn't be surprised if they needed the dog to take him down.
It's still odd to think of the kid I played with when we were both 5 being this drunk, drugged out wreck of a man.