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After this article [1] was published, concerns were raised about undeclared competing interests, and about the study design and conclusions. In response to the concerns about declaration of potential competing interests, the authors have provided the following update to the Competing Interests statement: AJF is the Scientific Director and JY is the Technical Director of the Amino Acid Laboratory at the University of California, Davis (UCD) that provides amino acid analysis on a fee for service basis. AJF received remuneration for lectures or as an advisor on behalf of Nestlé Purina PetCare, Mars Petcare, Synergy Food Ingredients, the Mark Morris and Pet Food Institutes. AJF received funding from Nutro for graduate student training. A resident on the Nutrition Service, mentored in part by AJF, received funds from the Hill’s Pet Nutrition Resident Clinical Study Grants program, matched by the Center for Companion Animal Health, School of Veterinary Medicine at UCD. The Veterinary Medical Teaching Hospital at UCD received funding from Royal Canin to support a resident, and from Nestlé Purina PetCare to partially support a nutrition technician. AJF has a contract with the FDA on unrelated research. Since the time of article submission, JAS has received research support from Nature’s Variety Inc. Collectively, this did not influence the collection or interpretation of results in this study. There are no patents, products in development or marketed products to declare. This does not alter our adherence to PLOS ONE policies on sharing data and materials. Concerns raised about the study are outlined below. The authors noted that some of these issues were discussed during pre-publication peer review and/or in the published article.