Answer:
Nurture
Explanation:
Nurture can be defined as caring and protecting someone or something while they are growing up. Nurture fosters personality to the being care is given to.
A Dog that is cared for and taking good care of suddenly becomes adapted to the environment and imperative it is required of it to behave calmly and in a loving manner.
The nurturing from the new owners transformed its personality from wild and aggressive to lovely and calm.