Answer:
nurture
Explanation:
Nurture involves the action of caring for the needs of the dog such as food, shelter and comfort. When this is done, the dog becomes more comfortable in the new home and becomes more affectionate towards the new owners. On the contrary, if the dog is treated harshly by its new owners, it may likely run away from the home, become more hostile and territorial towards the new owners.
Nurture is responsible for the dogs new behaviour.