Why are there so many worms in my horse's field after worming?

Question

I got my mare cloud about 1.5week ago , I wormed get the other day .... today when I poo picked her field there was a TON of worms there , should I get a vet ?????? Pet's info: Farm Animal | Horse | Female | unspayed | 4 years and 11 months old | 992 lbs

Andrea M. Brodie, DVM · Accepted Answer

This means that the wormer worked, but it also means that your horse had a seriously large worm burden. You should worm your horse again about 18 days from the last worming and that should then also take care of worms that hatched from eggs laid by the now dead worms. It may be advisable to take a fresh stool sample about three weeks after the second worming and take it to your vet for a fecal exam to make sure that all worms are gone.

Why are there so many worms in my horse's field after worming?

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