It's been my recent experiences that if a horse is running in or out badly and there is no apparent lameness issues, 7 out of 10 times it's the lower hock joint on the opposite side---IMO.

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Wow that is what my Trainer says hocks or stifle .
so lower hock joint oposite witch if rightline would be left hind hock the lower that is so interesting hardline im going o pull out some plates of exrays I have of the lower joints and check them out great info.