Is Dogbane Poisonous? – Toxicity to Dogs, Cats, and Humans

Dogbane is toxic to dogs, cats, horses, and humans. The plant contains cardenolides, which are cardiac glycosides that interfere with the heart’s electrical system. Actual poisoning is uncommon because the plant tastes very bitter and most animals avoid it, but ingestion can be serious when it does occur.

The ASPCA lists dogbane hemp (Apocynum androsaemifolium, also known as Bitter Root and Indian Hemp) as toxic to dogs, cats, and horses, with cardenolides as the toxic principles. Clinical signs include diarrhea, slow heart rate, and weakness.

What Part of Dogbane Is Toxic?

All parts of the plant contain cardenolides, including the leaves, stems, roots, and milky white latex sap that oozes out when a stem is broken. The roots and latex tend to have higher concentrations than the above-ground green parts.

Dogbane is a North American native perennial that grows in meadows, roadsides, and open woodland edges. Dried plant material, including hay contaminated with dogbane, retains its toxicity.

Symptoms of Dogbane Poisoning

Dogs and cats

• Diarrhea, sometimes with blood
• Slow heart rate (bradycardia)
• Weakness and lethargy
• Vomiting
• In severe cases: cardiac arrhythmia and collapse

Cardenolides inhibit the sodium-potassium pump in heart muscle cells, disrupting normal cardiac rhythm. This is the same mechanism as foxglove (Digitalis) and oleander (Nerium oleander).

Humans and children

• The bitter taste of the plant and sap is a strong deterrent to accidental ingestion
• If consumed: nausea, vomiting, and abdominal pain
• Slowed or irregular heart rate in significant ingestion
• Skin and eye irritation from the latex sap

Adults are rarely poisoned by dogbane because the taste is extremely unpleasant. Children who handle the plant and then touch their mouths or eyes are at greater risk from the sap.

What to Do

1. Remove any remaining plant material from the mouth.
2. Do not induce vomiting unless directed by a medical professional.
3. Call poison control at 1-800-222-1222 (US) or your vet immediately.
4. If the heart rate seems very slow or irregular, treat as an emergency.
5. For pets, a vet may need to monitor heart rhythm and provide supportive care.

Cardiac glycoside poisoning can progress over several hours. Seek evaluation promptly even if initial symptoms seem mild.

Identification and Safe Handling

Dogbane is a wildflower, not typically planted as an ornamental. Exposure is most likely for people who spend time in open meadows or along roadsides. Horses and livestock grazing in affected fields are at risk if the pasture contains dogbane.

• Learn to recognize the plant: opposite oval leaves, clusters of small pink flowers, paired long seed pods, and milky white sap when the stem is broken.
• Wear gloves when handling; the latex sap irritates skin and eyes.
• Check fields and pastures for dogbane before grazing livestock.
• Hay should be checked for dogbane contamination, as dried plant material remains toxic.

Frequently Asked Questions

Why is it called dogbane? The common name reflects historical use of the plant as a poison intended to harm dogs. The Latin genus name Apocynum translates roughly as “away from dogs” in Greek.

Is dogbane the same as milkweed? They are related but different plants. Both produce milky sap and have long paired seed pods, and they can look similar at a glance. Milkweed (Asclepias species) and dogbane (Apocynum species) belong to the same broader family and share a similar cardiac toxicity profile. Neither is safe for pets or livestock.

My dog was playing near dogbane plants. Should I be worried? If your dog only ran through the area without chewing the plant, the risk is low. If you saw your dog chewing the stems or leaves, contact your vet promptly. Cardiac symptoms can take time to appear.

Is the milky sap dangerous on skin? It is irritating. Wash any sap off skin with soap and water promptly. If sap contacts the eyes, flush with clean water and seek medical attention.