According to the video, since dogs became a best friend to human kind, they have played several vital roles in human lives. Some of the significances of a dog include: Dog provide company to humankind, especially at home to people who live alone and don't like socializing. Also, dogs give a sense of purpose to human kind through companionship with them and care. A dog is beneficial to humankind through the provision of security. Dogs offer protection by alerting their owners on the events of unusual circumstances at home or other relevant areas. Likewise, dogs can protect other domesticated animals in the event of danger; thus, they usually act as a sense of security to human kind since they became a best friend to human kind