A dog's immune system works hard to combat daily exposure to disease, toxins, environmental stressors, and free radicals. Its importance in keeping a dog healthy cannot be underestimated. Therefore, it is imperative that everything should be done to keep a dog's immune system as strong as possible. This is why the PEDIGREE Dry Recipes have been formulated to meet the Four Universal Needs of Dogs, which includes Immunity. PEDIGREE Video: The Four Universal Needs of Dogs