And I have no earthly idea what it is. I initially thought he popped a splint, but it's hard as bone and doesn't move at all. It's on his left leg, right below the knee on the inside of the canon bone. It's been there for a good six months and hasn't changed at all. He's not off the that leg and it doesn't seem to bother him. I don't have pictures, but I can get some next time I go out. There was also a mare that had the same thing, and also didn't seem affected by it.
From the description, do you think it's something I need to worry about? Does anyone know what it is? I'm clueless.