Castor Bean

Yes, castor bean (Ricinus communis) is highly toxic to cats. The plant contains ricin, a potent toxin found throughout the entire plant, with the highest concentration in the seeds. Any ingestion is considered a medical emergency.

Early signs include oral irritation, burning of the mouth and throat, drooling, intense thirst, vomiting, and diarrhea — which can begin within minutes to a few hours of chewing seeds. As ricin spreads, symptoms progress to weakness, abdominal pain, trembling, loss of coordination, and bloody diarrhea. Severe cases can advance to convulsions and kidney failure within 1–3 days.

Get your cat to a veterinarian immediately — do not wait for symptoms to appear. On the way, call ASPCA Animal Poison Control at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661. Bring a sample or photo of the plant and a count of seeds if possible, and do not attempt to induce vomiting at home unless explicitly directed by poison control or your vet.

Oral irritation and vomiting can begin within minutes to a few hours of chewing seeds, but full systemic signs typically develop 12–48 hours after ingestion. Without aggressive in-clinic treatment, severe cases can progress to kidney failure, convulsions, and coma over 1–3 days — which is why any suspected ingestion is a 'go now' emergency, not a wait-and-see situation.

Yes, castor bean (Ricinus communis) is extremely toxic to dogs. The plant contains ricin, a highly potent toxin found throughout the plant — including leaves, stems, and roots — with the highest concentration in the seeds. This is a true emergency: immediate veterinary intervention is required if ingestion is suspected.

Symptoms can begin within hours of chewing seeds (oral irritation, heavy drooling, vomiting) but the full toxic picture — including bloody vomiting, diarrhea, abdominal pain, weakness, trembling, dehydration, and labored breathing — typically develops 12–48 hours after ingestion. Without aggressive in-clinic treatment, severe cases can progress to organ failure and death over 1–3 days.

Get to a veterinarian immediately — do not wait for symptoms. Bring a sample of the plant or any remaining seeds for identification. Do not try to induce vomiting at home unless poison control or your vet specifically instructs you to; decontamination with activated charcoal and IV fluids is most effective when done at the clinic. Call ASPCA Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661) on the way.

The seeds (castor beans) carry the highest concentration of ricin and are the highest-risk part of the plant, but ricin is present throughout the entire plant — leaves, stems, and roots are all dangerous. Even a small number of seeds can be lethal to a dog, so there is no 'safe' part of this plant to have within reach of a pet.