He developed this limp yesterday. Its in his right front leg. I don't see any visual evidence of an injury. His pasture is pretty bare right now...muddy, a few rocks and sticks. Although we have been working on the barn so there are boards laying around. IDK if you need all that info or if you need more...but I was wondering if there is anything I need to be checking for that maybe I (a first time horse owner) may not know to look for? Any suggestions are welcome and appreciated!