Mercy Dogs of World War 1 who brought care and comfort to the wounded and dying

> The dogs were trained in triage, able to indicate who needed aid the most and who was too far gone to establish any medical care.

That's a crazy concept to even conceptualize. As a non-medically trained person, if I was to triage 5 injured people, assuming it wasn't terribly visually obvious (ex: missing leg)... I'd probably do a terrible job of it. Somehow they trained dogs to do so? Which really begs the question: What is the smell the dogs are looking for?