Usually once the joints have fused bone spavin is not an issue, however getting to that point is what requires surgeries, injections and painful years for the horse so there may be some residual issues from that. Physically as long as the fusing went ok he should he fine. Bog spavin on through other hand is basically unmanageable as those joints can't be fused.
I would recommend putting the horse on adequan, possibly legend and an msm supplement because of his age and history to prolong his comfortable years in work. Good luck!
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