Safe-Guard Equi-Bits Horse Dewormer, 1.25-lb bag; Help protect your horse with Safe-Guard’s Equi-Bits Bag for Horses. These alfalfa-based pellets are designed with Safe-Guard’s active ingredient, fenbendazole, which helps control large strongyles, small strongyles, pinworms and ascarids. Simply, pour the pellets on top of her daily ration to feed and deworm in one easy step! Equi-Bits are a safe and suitable option for all horses, including pregnant mares and foals.