For older dogs, easily digestible proteins are particularly important to maintain muscle mass and support overall body function. Dietary fibers promote healthy digestion, while antioxidants help reduce cell damage caused by free radicals. Omega-3 fatty acids are important for joint health and skin care. In addition, vitamins and minerals such as Vitamin E, Vitamin C, and zinc should be sufficiently present to strengthen the immune system and prevent age-related deficiencies.