CORE Senior has added glucosamine hydrochloride & chondroitin sulfate to support hip & joint health, also supported by omega fatty acids for skin & coat health and fortified with vitamins and minerals to support a healthy immune system. CORE recipes are crafted based on the nutritional philosophy that dogs, based on their primal ancestry, thrive on a natural diet mainly comprised of meat. Our Grain-Free, Protein-Rich dry dog food is packed with premium protein along with nutrient-rich superfoods and nutritional supplements to ensure your dog has everything they need to thrive from the CORE.