One-year-old golden retriever Bertie developed a dislocated hip joint and curvature of his spine and is in a lot of pain. Noel has to find an implant to treat Bertie's arthritis and prevent his hip from dislocating and work out a way to manage the effect of his spinal deformity over time. Trusty Tibetan terrier, nine-year-old Sunny recently received a total knee replacement using an implant system called a rotating hinge. However, before a second procedure is staged a flare up of the auto-immune inflammatory arthritis in Sunny's carpi casts a dark cloud over his future once again