Hi, a few weeks ago I found my male indian runner hiding under a tree and his ankle was really swollen. I'm pretty sure it wasn't broken, and I couldn't find any external wounds, so I assumed it was a sprain. I penned him in the duck house so he could rest it up and made sure he got enough food. He seemed to be getting better for a while but now he's getting worse. He's still eating, but he can hardly walk. His ankle is still swollen. What should I do now? Help!