EntityTargetEvent and Wolf

Hi!

I have some problems with EntityTargetEvent and Wolf, when a wolf has a target set, it does not fire EntityTargetEvent, is this a bug or just my code?

Code:

@Override
public void onEntityTarget(EntityTargetEvent event) {
    Entity entity = event.getEntity();
    Entity target = event.getTarget();
    if (entity instanceof Wolf) {
        Wolf wolf = (Wolf)entity;

        if (target instanceof Player) {
            Player player = (Player)target;

            player.sendMessage("Wolf is attacking you!");
        }
    }
}