By then, they are ready for human exposure. Early contact with humans helps them overcome their fear and stress. Interactions should be positive to develop the pup. Control of the pup can be taught through training, handling and controlled play. A pup can't take strict discipline, punishments or stress.
Gentle reprimands work better.
You can introduce other animal species to your pup to help it learn how to get along with them. Supervise it closely. You will have succeeded when you can observe that your pup approaches the other animal in the same way that it approaches you or another dog. This means that it has accepted the other animal. This is also the time to train your pup in toilet-training.