The wolf mixes have a rep for killing dogs that live in the same household. They're also dangerous to have around small kids. Just about every dog and/or dog/woolf mixes that attack children have owners say almost the exact same thing - 'I don't know. He was always fine before'. Other owners then say almost the exact same thing - 'I trust my well trained dog/wolf mix with my kids'. Little kids make prey moves and prey sounds that can 'turn on' the predator response and next thing the owner knows is that the kid is dead. I've had Harris' hawks kill each other. That's remarkable because they're the only raptor that is know to live and hunt in cooperative groups. Recently, one tiger killed another when put together for breeding.