Many producers have experienced sickness and death from goats having eaten moldy hay. Hay must be baled dry and stored in a dry location. They will lose control of their legs, stagger, have difficulty maintaining their balance, and in advanced stages of these illnesses, the neck will be both rigid and bent to one side while the eyes are not focused. Sometimes an afflicted goat will suffer blindness. Further, Dex is a steroid and should only be used under veterinary supervision.
Blindness usually goes away after a few weeks, once the thiamine treatment has been finished.
Breeders in the southeastern part of the United States have lost lots of goats by feeding them sileage. Sileage is green chopped corn or grass or virtually any other forage that is cut and only partially dried, chopped into small pieces, and packed down tightly into a pit silo or airtight bag. Air tight is the key to producing useable sileage. Then it is allowed to ferment, going through an alcohol stage and then a pickled stage. When air gets to sileage, it molds, and that kills goats.