Foxglove can kill dogs within hours through heart arrhythmias.
Every part of the plant — flowers, leaves, stems, seeds and even water from a vase — is dangerously toxic.
Foxglove contains cardiac glycosides (digitoxin, digoxin) that inhibit the Na+/K+-ATPase pump in cardiac muscle. This causes intracellular calcium accumulation, severe bradycardia, AV block and life-threatening arrhythmias. Digoxin from this plant is the source of the heart medication of the same name.
Sources
Less than 1 g of dried leaves per kg body weight can be lethal. Activated charcoal and IV cardiac support are required.
Contact your veterinarian or an emergency animal poison hotline immediately. Do not induce vomiting unless instructed by a vet.
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