I've been trying to decide where on my property to place my chicken coop and runs. My biggest concern though is how water runoff from the runs will affect my other animals, specifically my horses. The way my property lays, the runoff will either go across my pasture and into a tiny retention pond or go across my other pasture into a creek that goes through my neighbors' properties. Has anyone else had problems with other non-avian critters catching disease or parasites from their chickens? Am I being overly cautious or are my concerns valid?