SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/horse-oleander-heart

Oleander is dangerous to horses because its toxins act on which organ?

The heart, through cardiac glycosides.

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  1. Hooves
  2. Heart ✔
  3. Eyes

Why: Oleander contains cardiac glycosides, compounds that disrupt the heart. Signs include drooling, belly pain and colic. Keep ornamental plants away from pastures.

Huh, didn't know that: The ASPCA lists drooling, abdominal pain, diarrhea, colic and depression among the signs.

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References

Answer: Heart. Oleander contains cardiac glycosides, compounds that disrupt the heart. Signs include drooling, belly pain and colic. Keep ornamental plants away from pastures.

  1. Oleander, ASPCA Toxic and Non-Toxic Plants www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/oleander
    Cardiac glycosides
    Checked 2026-10-10.

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