Golden Retrievers are energetic, naughty, and curious in the first 5-10 months after birth. When they reach adulthood, Golden Retrievers will become calm and quiet, able to understand their owners, and become More obedient than young. If the owner wants a smart and disciplined golden retriever, he can conduct simple training at 5 months old, so that the adult golden retriever will be very obedient to the owner's orders and instructions.