"We worm only when necessary. The wormer we chose is selected based on the parasites that show up in fecal analysis... By not worming on a "schedule," the parasites don't develop immunity to the wormer... We have heard folk say, “I worm with Cydectin every 30 days no matter what.” We strongly disagree with them. If, as we are told, Cydectin is in fact "the wormer of last resort," and we do not use Cydectin too soon, we stand a better chance of controlling the resistance problem."
