Here is the response I received from Royal Canin
Dear Mary
Thank you for taking the time to contact us. We appreciate all questions and comments from our customers. The percentage of protein on the new Yorkshire Terrier 28 has not changed it is still 28%. As for wheat gluten the reason that we have added that to the diet is because it is a 99% digestible protein source. Wheat gluten also offers your Yorkie a very important amino acid called glutamine. Glutamine helps preserve GI (gastrointestinal) health as it is the preferred fuel of small intestine mucosa. Please let me know if you have any other questions or concerns.
Warm regards,
Rachel
Technical Services
800-592-6687
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