the use of working dogs for hunting, shepherding, and for some roles in war date back to at least classical greek times (4, 5). for example, hearing dogs, matched with a handler who is deaf or hard of hearing, alert their handler to key sounds in the environment. it is then common for the dogs to return to a dedicated campus between 14 and 20 months, where they are housed in kennels as they progress through professional training. the influence …