Wrap the foot in a mix of tetracycline and oxy-tet or la 200. Use the liquid ( oxytet, LA-200) to make a yellow paste on cotten gauze, then vet wrap it on. The warts are extremely painful so hace a sturdy chute and tie leg up. Make sure the wart is scrubbed clean, preferrablly bleeding. Leave wrap on for three days; then remove wrap. Muriatic acid also works and is availible at hardware stores. We use to mix up a spray bottle of tetra, oxt-tet , water and sprayed feet in the parlor. ( use soft or distilled water so the iron doesn't bond with sulfa) Just get them early and watch them closely, eat can spread and screw up a herd