SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/horse-moldy-hay-lungs

Moldy hay is mostly a danger to which part of a horse's body?

The lungs and airways, from mold spores.

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  1. Eyesight
  2. Hooves
  3. Breathing ✔

Why: Mold spores in dusty hay are breathed in and can cause respiratory disease. Over time this can lead to heaves. If hay smells musty or looks dusty, do not feed it.

Huh, didn't know that: Mold grows on hay without preservatives at moisture levels over 15 percent.

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Where do sick horses go? The horsepital.
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References

Answer: Breathing. Mold spores in dusty hay are breathed in and can cause respiratory disease. Over time this can lead to heaves. If hay smells musty or looks dusty, do not feed it.

  1. Don't feed your horse moldy hay, UMN Extension extension.umn.edu/node/1466
    Most moldy hay problems are from mold spores, which can produce respiratory disease in horses.
    Checked 2026-10-10.

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