I also experience a lot of pain in my right ankle after running, as a result of an untreated injury when I was 14. I can't say whether or not the bone was broken, as I couldn't afford a doctor at the time, but I don't think a sprain would still hurt four years after the fact. Let me just say that ice is a God-send right about now.
Buddy, of course, has no problem. He loves it, almost as much as when I clip his long line on and let him run when we're hiking.