Does anyone have any ideas on how to firm up our 12 year old grade gelding's manure? He is in good health, but his cowflops can be most inconvenient, and it gets tiresome cleaning up his behind. Sometimes his manure is normally formed, and we can't always figure out why he get runny, although it has been very rainy and wet here for months. The diarrhea can be stress-related sometimes--he squirts when he sees the horse trailer. He gets Fast Track supplement, grass hay, some pasture, and Purina Ultium mixed with Horse Chow 100. A mini filly here is also loose at times, tho a bit less so.