08-07-2012, 09:08 AM
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Could be stifle, could be back, could be front foot issue. When there is no obvious sign of lameness it becomes really hard to tell. One thing you can do is take the cap of an ink pen, and (don't press hard - just push enough to have a light pressure) run it down the horses back next to the spine. From withers all the way back. Do it on both sides. If there is back pain, you should see a visible spasm or the horse should dip to get away from it.
If you find back pain don't automatically assume that is your issue because many times back pain comes from compensation of something else.... That's a place where I would suggest your start though.
It's hard to automatically assume that the issue is a stifle though from the symptoms you are giving because they can be caused by so many things.