Osteoarthritis (OA) is a degenerative condition affecting the cartilage, bone, and surrounding soft tissues of a joint. In people, it is commonly associated with “wear and tear” as we age and can result in a painful or stiff joint. In dogs, OA is most commonly associated with an injury such as a cranial cruciate ligament rupture, or secondary to abnormal development such as Canine Hip Dysplasia (CHD).