The domestic dog (Canis lupus familiaris or Canis familiaris) is a domesticated canine which has been selectively bred over millennia for various behaviours, sensory capabilities, and physical attributes. Dogs perform many roles for people, such as hunting, herding, pulling loads, protection, assisting police and military, companionship and, more recently, aiding handicapped individuals. This influence on human society has given them the sobriquet, "man's best friend".