Most dogs I see walking with owners are not trained. They may think they are,but against a train dog you will see a big difference.
I personally believe it's the owners we need to worry about, not what the dog's breed is.
I had full verbal and visual(hand signals when out of hearing range) control over my Rottweiler.
He would obey the correct commands that my friends would give him.
When I took him walking with no leash attached, and we came upon another large dog around a corner with little warning with no owner, I would tell him to "drop".
He would hit the deck,which would give message to other dog he is no threat, the other dog would walk pass with both dogs watching one another,but no fight.
If you have a powerful dog you must have complete verbal control over him at ALL times and ALL situations.When they are at that level, they are a pleasure to have,with no worry.
The training classes trains YOU to train your dog.
