Noel Fitzpatrick treats a six-year-old shih-tzu (Lucky) which can barely walk due to the severe arthritis in its hip and a family Labrador (Bongo) suffering osteoarthritis in all four legs, which is brought in to fuse the ankles on its hind legs. He also helps a four-month-old German shepherd (Mason) with a genetic disease affecting its joints - but the test results are worse than the professor feared and It will require all his surgical skills to repair.