Veg.Dog Food From Purina?
there's no mention on their webpage but apparently they are producing a soy based food, which is not much of a stretch considering almost all their foods get almost all their nutritional value from grains.

"Meanwhile, dog owners looking for a meat-free food, or just interested in the benefits of soy, have a new option. Purina’s Beneful brand, a higher-end line, is introducing Beneful Healthy Harvest, made with soy-based proteins instead of meat.

“There’s a niche of consumers who are looking for that kind of thing, it’s not a groundswell,” said Steve Crimmins, vice president of dog food marketing at Purina."