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SESK: Stuff Everyone Should Know · sesk.info/horse-black-walnut-bedding

Black walnut shavings in horse bedding can cause poisoning at what share of the bedding?

As little as 20 percent.

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  1. Only if it is 100 percent
  2. Only above 80 percent
  3. As little as 20 percent ✔

Why: Black walnut wood is toxic to horses on contact and if eaten, even in a mixed bedding. Signs can show within hours and include founder. Check bedding labels and avoid walnut.

Huh, didn't know that: UMN says the innermost wood of the black walnut causes toxicity after oral or skin contact.

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References

Answer: As little as 20 percent. Black walnut wood is toxic to horses on contact and if eaten, even in a mixed bedding. Signs can show within hours and include founder. Check bedding labels and avoid walnut.

  1. Black walnut: a toxic horse bedding, UMN Extension extension.umn.edu/node/14411
    Bedding containing as little as 20 percent fresh black walnut shavings, made from old or new wood, can cause toxicity.
    Checked 2026-10-10.
  2. Black Walnut, ASPCA Toxic and Non-Toxic Plants www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/black-walnut
    Horses: laminitis, colic
    Checked 2026-10-10.

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