07-12-2011, 02:16 AM
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Lots of vets these days advise de-worming a horse on a sporadic timetable after having fecals run. Using wormer too often creates pesticide resistent worms and that's a bad deal all the way around. If they run a fecal, then you'll know if they need wormed (some horses don't, some of mine haven't been de-wormed in over a year and are still worm-free), and which wormer would work best for the type of worms that they have.
Short answer is that if you power pack her now, no, you won't want to worm her again for her regularly scheduled de-worming in a couple of weeks. The power pack would count as this scheduled de-worming.