Our customers giving Dog-On to their dogs report noticeable differences in ease of movement within 10 days. From not climbing stairs anymore to easily climbing up the stairs again. A formula of Condrointon, Glucosomine and shark cartilidge in convenient palatable biscuits. Glucosamine Sulphate and Chondroitin Sulphate are considered the two most important supplements for reducing joint pain and repairing and rebuilding joint cartilage and connective tissue.