My dog injured his his hock a few months ago. We believe he may have been bitten as there was a wound directly on the hock. By the time we had got him to the vets his hock was very swollen and he was limping very badly on it. He was on antibiotics for about 3 weeks and completely out of action. After the pain was gone and it was healed the vet told me he would be ideal for physio, But we can't afford it. The vet told us he would probably suffer from arthritis in his later years and may not ever be 100% on it again. He is an agility dog so I worry the high impact obstacles are too much for him. Is there anything I could give him, perhaps supplements or exercises to help strengthen it?