With pet osteoArthritis, bones are damaged because cartilage has given way. Cartilage is there to act as a cushion preventing bone from hitting bone as the joint moves. If the cartilage dries, roughens, or chips, bare bones are exposed. The exposed bone flattens and loses resilience so the joint no longer moves smoothly; it jerks and creaks. This can be made better by using glucosamine for dogs. In response, the body sends white blood cells to the joint, but instead of repairing damage, the white blood cells release enzymes and free radicals that make things worse. The synovial fluid bathing the joint loses viscosity because it is damaged by the white blood cells’ enzymes. As the synovial fluid thins, it’s no longer able to resist joint compression or provide lubrication. Eventually, even the capsule that surrounds the joint inflames. The pet then has painful arthritis.