DuraFend DeWormer is a multi-Species medicated dewormer indicated for the control and removal of worms in beef and dairy cattle, horses, and zoo and wildlife. Contains 2.27 gm fenbendazole per lb. Contains .5% (2.27 g/lb) fenbendazole removes and controls a variety of worms. No milk withdrawal period for dairy cattle. Pellets may be top dressed or blended with feed. 1 lb package.