Arthriaid HA is a combination joint supplement for cats and dogs. it contains the necessary buliding blocks (Glucosamine, Chondroitin and MSM) to help the body manufacture cartilage it also contains Hyaluronic Acid (HA) which is a major joint fluid component.Instructions for use for cats and dogs is as follows, 0.5kg 2 grams, 5-10kg – 3 grams, 20-40kg 5 grams, 40kg + – 6 grams. After 3 weeks drop dose to 1/2 given