I am reading this with interest.
I always believed the pack thing to be true, it made sense to me.
I am willing to re-think now.
Caeser Milan's methods are dreadful but they are popular. They feed into 'our' need to be in control of an otherwise 'dangerous beast' IYSWIM.
Barbra Woodhouse was hugely, amazingly popular back in the day. She reached near mega stardom by shouting at dogs and half choking them into submission.
I am impressed by the new, kinder methods of dog training. They make sense to me as someone who works in child development. They follow the same sort of rules (only they use more sausages 
The thing about pack/dominance though...
Why does keeping some dogs off the furniture/bed help with snappy, aggressive behaviour?
I know it does. I have seen it work. I have had dogs that could sleep on your bed and be the model of good behaviour but others that really need to know their place in what would have been called the 'pack order'.
But if there is no pack order, why does it work?
Genuine question. I am really interested.