Horse riding help?

basically if you care about the enviroment its horse back riding wether it be where your riding the horses well one you can't really say where the horse goes do its private things you could if its in a field they just go where they stand basically the rancher cleans up that mess but now if you ride out on the road the horse just does its business where it is standing or walking not sure wether that gets cleaned up or not have no idea now the horse tracks or rodeos i'm sure they do modified enviroment so it would be taken care of