35,000 years. from humble beginnings, helping men hurt, they have nuzzleed into our hearts. for millions they are family. my daughter keeps reminding me she wants to expand our already expanded family to include a four legged friend. it s that idea of seeing dogs as family that led our next guest to wonder if after losing his 14-year-old pug, if his dog loved him the same way he loved him. dr. gregory burns a newer scientist decided to train dogs to undergo mris, how dogs love us. they decode the canine brain. i have to start with the question on everybody s mind. how did you get dogs to sit through mris? it s not easy. people don t like them because