Safe-Guard® 11124488 Medicated Dewormer for Beef/Dairy Cattle & Horses, 5 LbsSafe Guards active ingredient, Fenbendazole, is the only one FDA approved treat all stages of encysted small strongyles. Worms are a constant threat are a constant threat. If left untreated gastro intestinal parasites can cause great suffering or even death in your animals. That is why safe guard should be part of your strategic deworming program. Size: 5 lbs 0. 5% dewormer Medicated for beef & dairy cattle and horses Active drug ingredient: 0. 5%