The pit bull begins to become aggressive in the 5th month after birth. At this time, the pit bull's body and personality are in the growth stage, so he is very curious about things and the outside world, and his fighting spirit begins to become fierce. At this time, the owner You can discipline your Pit Bull and simply train your Pit Bull. Use a combination of rewards and punishments to train your Pitbull so that you can develop the good habit of being obedient.