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Yew shrubs are toxic to horses because they contain which compounds?

Taxines (taxine A and B), which can cause sudden death.

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  1. Taxines ✔
  2. Caffeine
  3. Cyanide

Why: Yew is one of the most dangerous garden plants for a horse. Taxines affect the heart and can kill with little warning. Never toss yew clippings over a horse fence.

Huh, didn't know that: The ASPCA lists sudden death from acute heart failure as a sign of yew poisoning.

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References

Answer: Taxines. Yew is one of the most dangerous garden plants for a horse. Taxines affect the heart and can kill with little warning. Never toss yew clippings over a horse fence.

  1. Japanese Yew, ASPCA Toxic and Non-Toxic Plants www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/japanese-yew
    Taxine A and B, Volatile oil.
    Checked 2026-10-10.

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