There were a few people interested in knowing whether or not Merrick had used any by-products in any of thier ingredients. I sent them an email last week asking this info and just heard back from them 5 minutes ago. I copied and pasted thier response..
Hello Terri, I am sorry that your e-mail was not answered in a timelier manor. We do not us by products in any of our products. I hope this information helps. Thanks, Cyndi Merrick Pet Care Im relieved to see that they dont use any by products but Im a little disappointed in thier customer service. 