That is so gross and disgusting, and in more ways than one.
Sadly, as a country boy I can assure you that people often use back roads, parks, and rural areas as places to discard their dog or cat. Many times, its because they've already severely neglected their dog/cat, and they know full well that if they ever get caught, they'll pay dearly for it. So they deal with the problem not by getting medical attention for their pet, but by leaving their dog or kitty to either die or be helped by a more compassionate person. For that Peke, the help came too late.