Hehassharedourlivesfor20,000years.Alongtheway,hehashelpedusfindfood,keptourlivestock,protectedusfromourenemies,guidedusinextremeconditions,andsavedusfromperil.Now,hecomfortsus,relievinglonelinessandhelpinguscopewitholdage.Howdiddogscomeabout?