Got the xrays back from the vet that she took a few days ago...I got a chance to sit down and really look at them. Back when Luna was a 2yr old she apparently kicked a support beam in the metal barn my friend who bred Trixie and kept Luna at. When she had the vet out, he said it was a "bowed tendon". Um...wrong! Turns out, she broke AND fractured that left hind fetlock: Not sure what I am going to do, though she is on a good joint supplement and equioxx twice a week, which the vet said is good for her. Not off or gimpy on that at all...Just a really good mare that some vet misdiagnosed and didn't treat as it probably should of been.