Fresh Air guest host Dave Davies provides a wonderful introduction to Puppies Behind Bars (listen online), a nonprofit organization that lets inmates train bomb-sniffing dogs and companion animals for war veterans. Gloria Gilbert Stoga, founder and president of Puppies Behind Bars; Nora Moran, a former inmate who now works for the group; and Iraq War veteran Marine Cpl. Paul Bang-Knudsen illustrate how the program provides multiple benefits to the dogs, the inmates and the service dog recipients. Bang-Knudsen’s black lab Samba helps him cope with the challenges of post-traumatic stress disorder. For information about another prison training program, check out The Bark’s story on the Prison Pet Partnership in Washington State, where women inmates train shelter and rescue dogs to become service, seizure or therapy dogs, or to live as pets.