Our 6 month old Labrador Retriever was diagnosed with a condition called Osteochondritis Dissecans (OCD). We discovered this when she began to limp and her shoulder was sensitive. Apparently it is a developmental disorder where a piece of the cartlidge in her shoulder had a lesion, broke off and was free floating. In order to treat this condition she needed orthopedic surgery and hydrotherapy physical therapy. Thank you for being there when we needed you, PetPlan!