07-12-2012, 08:16 PM
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I would think it was far more likely to be EPM or West Nile Virus. Oklahoma has just had its first West Nile case this year. Both act just like you described.
If it is neurological, the best test is to have someone walk her forward while a second person pulls hard on her tail to the side. When the second person pulls sideways and a horse with a neurological problem, the horse will almost fall over and will tangle up their hind feet.
EPM is treatable, but must be caught early. Same is true of West Nile. Many horses that get it and are not treated early will get down, not be able to get up and will be lost.
I would call any condition that causes a horse to stagger in the hind end to be a medical emergency.