SAFEGUARD WORM BLOCK 25 LBSInvest in a reliable cattle wormer for your livestock, the Merck Animal Health Safe Guard Medicated Cattle Dewormer En Pro Al Molasses Block. The cattle dewormer block is indicated for the removal and control of lungworms, stomach worms, barberpole worm, brown stomach worm and a variety of others. This cattle dewormer can treat up to 8 mature cattle. It blocks for 3 days only as the sole source of salt. Adequate forage must be available at all times