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Plants that are Poisonous to Dogs

Writer's picture: Ida FanelliIda Fanelli

Updated: 15 hours ago



yellow and green leaves of euonymus plant

Years ago, my dog wouldn’t eat after his walk. My dog loves to eat, and I know he isn’t well when he doesn’t. My husband remembered seeing him eat a euonymus leaf at the corner of our flower garden before he entered from his walk. There are many types of euonymus plants. Some are more toxic than others.

Euonymus plants can cause gastrointestinal disturbances and cardiac glycosides, affecting your pet’s heart.

The chewing action releases the cyanide toxins in it. Symptoms of poisoning include vomiting, diarrhea and depression. Euonymus is poisonous if large quantities are ingested.

Luckily, my dog didn’t chew on the plant. He just swallowed it. We looked at his poo and saw a bit of blood around an undigested leaf, which indicated an irritation in his bowels. I gave him a foot detox, and he ate his supper later in the day. Once again, the foot detox saved me a visit to the vet.

I was aware that Dieffenbachia was poisonous. I’ve had one for years until my dog made many attempts to sneak around the protective barrier, we built around it to eat it. We eventually threw it out for his safety.


Plants that are poisonous to dogs are:

1. Sago Palm

  • Toxin: Cycasin.

  • Effects: Extremely toxic to dogs; ingestion can cause severe liver failure, vomiting, diarrhea, seizures, and even death. All parts of the plant are poisonous, especially the seeds.

  • Danger Level: Very high; immediate veterinary attention is required if ingested.

2. Tulips

  • Toxin: Tulipalin A and B.

  • Effects: Causes drooling, nausea, vomiting, diarrhea, and in severe cases, central nervous system depression. The bulbs are the most toxic part.

  • Danger Level: Moderate to high, depending on the amount ingested.

3. Lily of the Valley

  • Toxin: Cardiac glycosides.

  • Effects: Can cause vomiting, diarrhea, slowed heart rate, irregular heartbeat, seizures, and even death.

  • Danger Level: Very high; all parts are toxic, and symptoms can escalate rapidly.

4. Oleander Plants that are Poisonous to Dogs

  • Toxin: Cardiac glycosides (oleandrin and neriine).

  • Effects: Extremely toxic; ingestion can lead to vomiting, diarrhea, decreased heart rate, tremors, seizures, and potentially fatal cardiac arrhythmias.

  • Danger Level: Very high; even small amounts can be fatal.

5. Philodendrons

  • Toxin: Insoluble calcium oxalates.

  • Effects: Causes oral irritation, intense burning and swelling of the mouth, drooling, vomiting, and difficulty swallowing.

  • Danger Level: Moderate to high; severe cases are rare but still possible.

6. Rhododendron (Azaleas)

  • Toxin: Grayanotoxins.

  • Effects: Ingestion leads to drooling, vomiting, diarrhea, lethargy, tremors, low blood pressure, and potentially fatal heart failure.

  • Danger Level: High; even small amounts can be dangerous.

7. Dieffenbachia (Dumb Cane)

  • Toxin: Insoluble calcium oxalates.

  • Effects: Causes oral irritation, burning sensation in the mouth, drooling, vomiting, and difficulty swallowing. In rare cases, swelling of the throat can impede breathing.

  • Danger Level: Moderate.

8. Japanese Yews (Buddhist Pine or Southern Yew)

  • Toxin: Taxine alkaloids.

  • Effects: Highly toxic; ingestion can lead to sudden death due to cardiac failure. Symptoms include trembling, drooling, vomiting, difficulty breathing, seizures, and coma.

  • Danger Level: Very high; immediate attention is critical.

9. Hydrangea

  • Toxin: Cyanogenic glycosides.

  • Effects: Can cause vomiting, diarrhea, lethargy, depression, and confusion. In severe cases, it may lead to cyanide poisoning.

  • Danger Level: Moderate to high, depending on the quantity ingested.

10. Roses of Sharon

  • Toxin: Unknown specific toxin, but ingestion can cause gastrointestinal upset.

  • Effects: Typically causes vomiting, diarrhea, and lack of appetite. Severe reactions are rare.

  • Danger Level: Moderate.

11. Lavender

  • Toxin: Linalool and linalyl acetate.

  • Effects: Generally mild; ingestion can cause nausea, vomiting, and loss of appetite. Large amounts may lead to more pronounced gastrointestinal upset.

  • Danger Level: Low to moderate.


Be knowledgeable and careful of the plants around your dwelling if you have dogs. Many of these plants can be fatal if consumed in small amounts. If you suspect your dog has eaten any of these plants, seek immediate veterinary assistance. I've linked a holistic vet's YouTube information below. Activated charcoal slows down the ingestion if the appropriate amount is given within a few hours after ingestion. Always have it around to buy you some time if needed. Ask the vet's advice to gain some time before you get your dog to the clinic. Quick action can make a significant difference in the outcome.


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