Spirulina is an algae which is 60% protein and which is readily absorbed into the blood stream making this perfect for dogs which are unwell or have lost their appetite. Spirulina is also high in the essential fatty acid Gamma Linolenic acid (GLA) which promotes healthy skin and coat. Spirulina is an antioxidant which supports the immune system, especially helpful for the older dog. Spirulina can also support their aging eyes. Spirulina can also help the dog which loves to eat grass.