Healthy immune systems for pets is very important. A healthy immune system can prevent many illnesses and sicknesses from affecting your dog. Supporting your cat's immune system with certain products can prove to be very beneficial and worth the effort. Some products that can be used for immune system support include Vetri-Science Antiox, a nutritional supplement for the immune system, circulatory functions, and skin health of dogs, and Quinicarn L-Carnitine packets, a nutritional supplement for cats and dogs, providing active L-carnitine. L-carnitine helps in the conditions of physiological and metabolic stress on cats and dogs.