Out of the 8.5m dogs in the UK, 1.7m will develop arthritis and unfortunately it goes unrecognised and largely untreated in the majority of cases. OA results after a mobile joint is damaged and can be thought of as incomplete repair process. It starts with loss of the cartilage surface lining the joint which is important for smooth pain free movement but quickly spreads to all other parts of the joint resulting in pain and stiffness. At this time it is impossible to completely reverse this process but it can be slowed, and most importantly, it can be made a lot less painful. It is common in older animals but it can occur at any age after a joint is damaged. Pure breed dogs who are diagnosed with hip or elbow dysplasia as puppies will all rapidly develop osteoarthritis in the abnormal joints.