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SESK: Stuff Everyone Should Know · sesk.info/horse-foal-deworm-start

Per UMN Extension, foals should start a deworming plan targeting which parasite, at about what age?

Roundworms, starting before weaning at about 2 months.

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  1. Bots, at around 2 years
  2. Roundworms, around 2 months old ✔
  3. Tapeworms, at around 1 year

Why: UMN Extension says to start foals on a deworming program that targets roundworms. It should begin before weaning, around 2 months of age. Young horses are more likely to have parasites.

Huh, didn't know that: Merck says young horses need regular deworming because they are more likely to have parasites.

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How do you know when a foal is sick? It's a little hoarse.
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References

Answer: Roundworms, around 2 months old. UMN Extension says to start foals on a deworming program that targets roundworms. It should begin before weaning, around 2 months of age. Young horses are more likely to have parasites.

  1. Deworming your horse (UMN Extension) extension.umn.edu/node/1456
    Prior to weaning (about 2 months of age), start foals on a deworming program that targets roundworms.
    Checked 2026-10-10.
  2. Horse Parasites and Flies (Merck Veterinary Manual) www.merckvetmanual.com/horse-owners/routine-care-of-horses/horse-parasites-and-flies
    Young horses need regular deworming, because they are more likely to have parasites.
    Checked 2026-10-10.

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