We got home late from a visit up to Waco (~100 miles away) yesterday to watch a horse show.
We got to the stables fairly early despite the late night around 9:00 a.m. LBR had finished his breakfast and was enjoying his flake of alfalfa.
Gary brought him up from the paddock and groomed him while I staged the tack. LBR was acting up under saddle for Cindy in the sand arena so Gary lunged him in the grass arena. LBR was still hyper-sensitive to the trot queue so Cindy dismounted, checked the girth/saddle and tried again. Something unknown was really bothering him so Cindy ended on a good note of just trotting some serpantines.
When we took him back to the grooming stall, de-tacked and brushed, we found the problem. LBR had a thorn (approx 1/2" long) behind his left front elbow. Poor boy:-( Gary removed it, rinsed him off and we let him graze in the shade for an extra long time.