What is man's best friend?

Man's best friends usually refers to a dog or it is a way to refer to a domestic dog.  This phrase refers to many traits that dogs exhibit such as: loyalty, companionship, and friendship.  They never stop loving, and do not have an ability to feel hate or show hate as people interpret it.  Any behavior that looks opposite of "Man's Best Friend" could be as a result of neglect or animal abuse.