Here is a video of a Cane Corso puppy being taught at a young age that growling at owners to warn and using mouth to correct the owners are acceptable behaviors. These behaviors are being learned during the imprint period of puppyhood, which is not what we want to do. Before even getting a puppy, I would recommend strongly assessing what type of energy dog is best for you. Picking an incompatible energy, especially in a power breed like a Cane Corso, can lead to a lot of problems, no matter what