I'm always switching Magnum's protein, in the hopes of not enticing an allergy. So he has had most commericially-available protein sources. No problems at all (fingers crossed), even with chicken, which is the top protein allergen (according to my sources and research).
FOOD RECALL-Purina Horse & Fish Feed Products
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I was not sure where to put this but I know some of you own other animals!
Here is the information:
http://poisonedpets.com/2012/07/14/recall-purina-feed-products-due-to-elevated-vitamin-d-level/
Jennifer