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When a horse has EPM, can it lose range of muscle movement in the hind end? In this case, the animal appears to have a shortened forward reach with the hind end with a diagonal step.

Last Updated: January 17, 2008

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If the neurological damage from EPM includes a wasting away of part of the rear musculature of your horse, changes in the walk can be expected. If your horse has normal, symmetrical musculature in the hind end, EPM may not be the cause of the gait changes seen. Neurological gait abnormalities typically involve weakness (paresis) and incoordination (ataxia). Since your horse is consistently stepping short behind, I would suspect a lameness problem rather than a neurological problem. To determine the cause, have your veterinarian perform a complete physical exam including a lameness/neurological evaluation.

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