Best Friend

http://en.wikipedia.org/wiki/Man's_best_friend_(phrase)

Tube
https://www.youtube.com/results?search_query=Dog+Is+Best+Friend

Site
http://www.mans-best-friend.org.uk/

Reasons
http://fb-troublemakers.com/20-reasons-why-dogs-are-mans-best-friend-11949/

Stories
http://mashable.com/2013/03/12/dog-mans-best-friend/