I know Preacher has had his issues with allergies, does he have to be on a grain free diet because of that? Just a quick look tells me most, if not all varieties are grain free. The biggest concern for me is the fact that the variety I looked at had peas and potatoes pretty high on the list of ingredients. Recent studies are pointing to those ingredients as being a potential problem.
Here's a link with the best info I could find
Canidae Dog Food Reviews, Ingredients, Recall History and Our Rating
I wish I could feed raw but Drake didn't do well on it at all. He loved it but the results were not good. I decided on a rotation diet with toppers that has worked really well for both of my dogs. It's tough finding something that works. I wish you luck.....