It's either fractured or badly sprained. He has fractured it so many times that the doctors don't *think* it has broken this time but aren't sure. It certainly wasn't fun to hear him screeching in the garden and running out to find him on the floor. I was expecting to see the bone poking out when we took his shoe off. Oh! The perils of walking on your own lawn!! He tripped over a small hole (probably done by one of the diggy dogs).