My paint mare always stinks in the winter *sigh* I've tried keeping her stall as clean as possible (cleaning it every single time I'm down at the barn, 5-6 times a day) so she never lays in her own yuck. Cleaning her feet just as often, and spraying with bleach and water twice a day, though maybe it was from between her teats. So Did that everyday. And no deal. She just stinks in the winter, she isn't ill and passes the vet check every year(even though they scratch their heads at her smell in the winter). And I've pretty much given up, I brush her, keep her feet and stall just as clean as the others now. (stall once a day, feet twice, brushing at least once a day normaly twice) And just try to ignore the smell when she wants to stand by me lol.