I did an animal care course many years ago, I was also working as a untrained vet nurse...and we covered the pack mentality behavioural tips. You need to be 'top dog' especially with a large 'dangerous' breed.
Another big thing for determining where they sit in the pack is eating...the top dog always eats first.
Always see the dog see you eat first and then feed them...that way you are top dog above them.