
A good working gundog has to be able to distinguish between a live pheasant, partridge, or other game, shot and wounded game and dead game. I know my own dogs are used for "dogging in" healthy unshot game, then when shooting they have to be able to find dead and wounded game and of course bring it to hand, but leave the unshot alone. They do it so naturally, so there must be some differences they are looking for.
I wonder if it has developed because a wild hunter like a dog might hunt for food or might scavenge food? An easy meal might be more attractive than one that has to be caught first? With selective breeding these talents may well have become enhanced and now are adaptable to our uses what ever they might be.