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Is oleander toxic to cats?

Also called: Nerium, Rose-Bay, Nerium oleander

Toxic

Contains heart toxins throughout the plant. Deaths have been reported even with treatment.

Yes, very. Every part of oleander contains heart toxins. It can cause vomiting, an irregular heartbeat, weakness and collapse, and cats are thought to be more sensitive than dogs.

Signs to watch for

  • Drooling, abdominal pain, diarrhoea, an irregular heart rate and rhythm, weakness and collapse.

Why it's dangerous

  • It contains oleandrin, a cardiac glycoside.

Sources

  • Toxic and Non-toxic Plants: OleanderASPCA Animal Poison Control · Read 9 October 2026
    Toxicity: Toxic to Dogs, Toxic to Cats, Toxic to Horses
    Clinical Signs: Drooling, abdominal pain, diarrhea, colic, depression, death
  • OleanderPet Poison Helpline · Read 9 October 2026
    Oleander contains oleandrin, a cardiac glycoside toxin, throughout the plant.
    cardiovascular dysfunction (e.g., irregular heart rate and rhythm) and neurological signs (e.g., weakness, collapse).
  • Houseplants and Ornamentals Toxic to AnimalsMerck Veterinary Manual · Read 9 October 2026
    Fatalities have been reported after oleander and foxglove toxicosis even with aggressive treatment.
    Cats are believed to be more sensitive than dogs.
  • Top 10 toxic household plants for petsVCA Animal Hospitals · Read 9 October 2026
    These plants contain cardiac glycosides, which can cause drooling, diarrhea, abdominal pain, abnormal heart rhythm and neurologic signs.
  • Cats and poisonsInternational Cat Care · Read 9 October 2026
    If you’re concerned your cat has come into contact with any of the substances listed, contact your veterinary team immediately

Information from ASPCA Animal Poison Control, Pet Poison Helpline, Merck Veterinary Manual, VCA Animal Hospitals and International Cat CareSources checked 9 October 2026

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