Durvet Safe Guard DuraFend is a multi species medicated dewormer formulated to control and remove a wide range of internal parasites in many animals. The pelleted formula can be top dressed or mixed with feed for convenient administration. It contains fenbendazole at 0.5 percent providing 2.27 grams per pound as the active drug ingredient. The 1 pound size is approved for use in beef and dairy cattle swine growing turkeys Rocky Mountain bighorn sheep horses wildlife zoo ruminants and feral swine. The 5 pound 10 pound and 25 pound sizes are approved for use in beef and dairy cattle horses and zoo and wildlife animals.