The one we had in class was extremely shy and strong and not a good pet. The other dogs didn't like it and it had to be kept well away them. It never did bark or respond to the other dogs but just stared, and I do believe it could have killed any of the other dogs, given the chance. The owner was a big man and had to keep both hands on the leash at all times or it would have taken off. The guy didn't make it through the class and I don't know what happened to it.