I am bringing this up here for a friend and her horse.
When she got him at age 3 he appeared to have no issues. He just turned 5 and is almost 17hh. Wonderful horse, great mind, really lovely movement till he canters. He cannot canter, he trips, counter canters in the back and literally can not bring his hind legs up under him. She said he had no issues before (I have only known them a few months). He kind of skips in back. She had the vet out, had him x-rayed and looked at at the vet believes it is his patella catching and not allowing him to fully extend. X-rays came back showing nothing. He does not act irritated by being hyper flexed. Has anyone heard of anything like this? The vet told her to exercise him more to try and build him up. But when we try to do anything more then a trot he cannot bring his leg forward to land on his heal and come right down on his toes in back and I am very concerned of REALLY hurting him. Has anyone heard of anything like this? I have told her to get a copy of the x-rays and seek out a second opinion