What happens to K9s after their time of military service is completed? Those who make it back often return, like their soldier counterparts, with PSTD, while others return with no problems. If the dog is fortunate, his handler, the person who knows him best, will adopt him. Otherwise, the animal is put up for adoption. Mims recounts the story of Doc, who was an IED sniffing dog who served in Iraq and Afghanistan, and is now living in retirement.