Innova Senior Plus For 9 Year Old Chihuahua

My Chihuahua, Enzo, is 9 years old. I feed him Innova Senior Plus because it is all natural, has glucosamine and chondroitin sulfate, has no animal byproducts and is human grade. I purchase it from Cindy's Health and Vitality, which is the only place in town that sells this line. I prefer not to feed my pets anything but human grade food that is made in the USA.