Jack had a job of great physical exigency, rescue dog in the Pyrenees. His shoulder and elbow problems were disabling for what he had done during all his life. A strong limp with severe pain was the consequence. He underwent an osteochondritis dissecans surgery with a disappointing result and, once the illness becomes chronic, it was the stem cell treatment the one that allowed him to return to work in three weeks. Nowadays he is active and ready for service.