Abstract: An eight month-old Labrador retriever presented to hospital with shifting leg lameness. Diagnosed by physical examination, X-ray, CT and arthroscopy, and the final diagnosis was fragmentation medial coronoid process of the elbow joints on both sides and osteochondritis dissecans of the knee joints on both sides. Arthroscopy was used to remove free bone fragments from both elbow joints and remove the cartilage flaps from the lesions in the knee joints on both sides; and abrasion arthroplasty was performed on the diseased area. Cooperating with rehabilitation treatment after the operation, the symptoms of claudication of the affected dog’s limbs were significantly relieved, standing with a balanced weight, and occasionally limped when trotting or walking.