Puppies do things that are "wrong."  Relatively few of them are him trying to assert dominance.  One must be careful not to overuse dominate discipline.  If the puppy is not challenging your authority, don’t use a dominant action.  The improper use of dominance can make a puppy shy and afraid.  If the puppy bites too hard when playing, squeeze his lip hard or thump his nose.  Discomfort teaches a lot.  Generally, if something causes discomfort, he won’t do it anymore.  If the puppy becomes more aggressive when corrected, he may need to be rolled but always weigh his attitude.  If it is just "puppy stuff," do not over-correct the puppy with rolling or scruff-shaking.   A squirt bottle with vinegar/water is very effective or a can of pennies shaken hard and loud are great tools when the puppy is engaged in unwanted behavior, i.e. chewing things other than his toys, putting his nose in the trash, etc.  The key to stopping unwanted behavior is consistency.  One day of inconsistency will set you back five with a Cane Corso.