DJ, I tried a Google search for the phrase "Low Oxygen Horse Stall." And while the search didn't turn up any info on low oxygen stalls for horses - it did turn up the following article:
http://horsesight.com/diseases%20_thrush.htm
Quote:
Thrush - A common bacterial infection that occurs on the hoof of a horse, specifically in the region of the frog. The bacteria occur naturally in the animal's environment, especially in wet, muddy, or unsanitary conditions, such as an unclean stall—and grow best with low oxygen. Horses with deep clefts, or narrow or contracted heels are more at-risk to develop thrush.
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Earlier this year I spent several weeks visiting family in the Phoenix area. The guest house I was staying in wasn't that far from The Phoenix Mountain Preserve. As a result my daily routine often included a morning run from the guest house to the trailhead where
Piestewa Peak is located - and from there a hike to the summit and back down - followed by a slower run back to the guest house.
While hiking the peak, I noticed many hikers wearing
these.
I can't speak for the effectiveness of such devices but they don't appear to be all that expensive.
It wouldn't surprise me if someone, somewhere, is already using such a device on a horse.
-jp
.