Just because a horse is standing in mud doesn't mean it is standing in faeces. Horses will select potty areas even when allowed to run on large tracts of land. In the nearby village which governs a large municipality, they came up with a ruling of no livestock, as per dept. of agriculture description, may be kept within 100 ft of the nearest neighbor's dwelling. It's a good law as there were those who's roosters disturbed the neighbors, yet outside the village many had acreages and were a goodly distance from the neighbors dwelling.