🚨 If symptoms are present — go to emergency vet NOW. ASPCA Poison Control: (888) 426-4435 (24/7)
Foxglove Poisoning in Dogs
Foxglove (Digitalis purpurea) is one of the most dangerous plants a dog can ingest. It contains cardiac glycosides — the same class of compounds used in heart medications like digoxin — which at toxic doses cause severe, life-threatening heart arrhythmias. Every part of the plant, including dried leaves, is deadly.
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⚡ Immediate Actions
- 1Call your vet or ASPCA Poison Control (888) 426-4435 IMMEDIATELY
- 2Go to an emergency vet — cardiac effects can be rapid and fatal
- 3Do not induce vomiting without veterinary guidance
- 4Bring a sample or photo of the plant
- 5Keep your dog calm and minimize physical exertion
Symptoms & Timeline
Early (1–4 hours)
Cardiac glycosides are absorbed from the GI tract and begin inhibiting Na+/K+ ATPase pumps before reaching the heart in sufficient concentration to cause arrhythmias. The initial GI symptoms reflect direct mucosal irritation from the plant material and early autonomic effects of glycoside absorption.
- Vomiting
- Diarrhea
- Drooling
- Abdominal pain
- Weakness
Cardiovascular (2–8 hours)
As cardiac glycoside levels rise in the blood, they inhibit the sodium-potassium pump in heart muscle cells, increasing intracellular calcium. This calcium overload disrupts the heart's electrical conduction system, producing a wide spectrum of arrhythmias — from bradycardia and heart block to ventricular tachycardia — that evolve unpredictably over hours.
- Slow or irregular heartbeat (bradycardia)
- Rapid heart rate (tachycardia)
- Weakness and collapse
- Pale gums
Severe
At high concentrations, cardiac glycosides trigger sustained ventricular fibrillation or complete heart block, preventing the heart from pumping blood effectively. Concurrent CNS toxicity from reduced cerebral perfusion and direct glycoside effects causes seizures and loss of consciousness.
- Seizures
- Severe cardiac arrhythmia
- Collapse
- Death
How Foxglove (Digitalis purpurea) Affects Dogs
Foxglove contains cardiac glycosides (digitalis glycosides) including digitoxin and digoxin. These compounds inhibit the sodium-potassium ATPase pump in cardiac muscle cells, increasing intracellular calcium and disrupting the heart's electrical conduction system. This causes a wide spectrum of arrhythmias — bradycardia, heart block, ventricular tachycardia — that can be fatal without rapid treatment.
What Your Vet Will Do at the Clinic
Foxglove poisoning demands continuous cardiac monitoring from the moment of presentation because arrhythmias can be absent on the first ECG and then appear hours later. Decontamination is performed only if the dog is alert and has no cardiac signs. Activated charcoal is given, ideally with sorbitol as a cathartic to speed GI transit of the toxin. Atropine counters vagally-mediated bradycardia by blocking the parasympathetic drive that cardiac glycosides enhance. For ventricular arrhythmias, lidocaine is the first-line drug because it stabilizes ventricular membranes. In cases unresponsive to standard antiarrhythmics, Digibind (digoxin-specific antibody fragments) can be used — these bind the cardiac glycosides directly and are cleared by the kidneys. Even if the initial ECG is normal, 24 hours of monitoring is mandatory because arrhythmias can be delayed.
Step-by-step protocol:
- 1Decontamination: induce vomiting if within 1–2 hours and dog is alert
- 2Activated charcoal with sorbitol to bind remaining toxin
- 3Continuous ECG monitoring — cardiac effects can be delayed and unpredictable
- 4IV atropine for bradycardia and heart block
- 5Anti-arrhythmic medication (lidocaine, mexiletine) for ventricular arrhythmias
- 6IV fluids to maintain blood pressure
- 7Digoxin-specific antibody fragments (Digibind/DigiFab) in severe cases — discuss with specialist
- 8Minimum 24-hour cardiac monitoring even if initial ECG is normal
Frequently Asked Questions
How common is foxglove in gardens?
Foxglove is a popular garden plant across the UK, Europe, and North America — it is widely used in perennial borders and cottage gardens. Dog owners who garden should consider replacing foxglove with safer alternatives.
Is dried foxglove still toxic?
Yes. Dried foxglove leaves retain their toxicity. The cardiac glycosides are heat-stable and persist in dry plant material, compost, and hay. Dogs that chew on dried flower arrangements are also at risk.
What is the prognosis for foxglove poisoning?
With early and aggressive treatment, many dogs survive. Without treatment, cardiac arrhythmias can be rapidly fatal. Speed of veterinary intervention is the most critical factor.
🛡️ Emergency vet bills average $1,500–$5,000
Most US dog owners pay out of pocket. Pet insurance can cover 70–90% of unexpected emergency costs.
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