These are the last moments that Marine Corporal Jeff DeYoung will spend with his black lab and best friend, Cena. The 10yearold bomb sniffing dog had to be euthanized because of an aggressive form of bone cancer, but not before getting a hero's sendoff. The marine and dog were first paired back in 2009 in Afghanistan, when Cena was just 9monthsold and DeYoung was 19. Now Cena is too weak to walk, making it heartbreaking to watch Corporal DeYoung pull his pal along in a wagon. #InsideEdition