If Mainstay combined all the corn ingredients, you'd end up with a very short ingredient list: corn, soybeans, beef and bone meal. I don't know. It still looks pretty yucky to me.

I'm also curious where you got your chicken definition from. This is what I found:
Chicken is the clean combination of flesh and skin with or without accompanying bone, derived from the parts or whole carcasses of chicken- exclusive of feathers, heads, feet, and entrails.
- AAFCO's definition

I also can't see how 0% protein is beneficial for a dog. Even dogs raised on vegetarian diets need substantial protein. How can a dog possibly survive and thrive on a 0% protein diet? I agree with Kay. I prefer to see no corn at all in a dog food. It doesn't matter how they space out their ingredients on the list. The fact is that corn is an undesirable ingredient and I would not feed anything that listed corn on the list.

Bri, can you buy Pro Plan? It's not the best, but it is loads better than other Purina products and it's fairly easy to find. I'm not sure how expensive it is, but I imagine no Purina product would be that costly.

Also, while it is claimed that Mainstay tested negative for pentobarbitol. It is undeniable that Mainstay and other Purina brands contain BHA. Hmm, carcinogens or anesthetics? It's up to you to choose the worse of two evils.