Why is caffeine dangerous for pets?
Caffeine is a methylxanthine (like the theobromine in chocolate) that pets metabolise slowly. It causes hyperactivity, a racing heart and tremors; at high doses it can trigger seizures or cardiac arrhythmia.
Dogs are commonly poisoned by leftover coffee, coffee grounds, or chocolate-covered coffee beans; cats by tea or energy drinks. Grounds and beans are much more concentrated than brewed drinks.
About the dose levels
Reference bands: <1–2 mg/kg usually no signs · ~10 mg/kg can cause restlessness · 30–70 mg/kg more severe · >70 mg/kg risks seizures and arrhythmia. Ground coffee is roughly 3x stronger than brewed by weight.
Reference bands: <1–2 mg/kg usually no signs · ~10 mg/kg can cause restlessness · 30–70 mg/kg more severe · >70 mg/kg risks seizures and arrhythmia. Ground coffee is roughly 3x stronger than brewed by weight.
Symptoms of caffeine poisoning
- Restlessness, hyperactivity, panting
- Vomiting, increased thirst and urination
- Racing heart, high temperature, tremors
- Severe: seizures, collapse, abnormal heart rhythm
What to do right now
- Call your vet if the estimated dose is meaningful or any sign appears.
- Do not induce vomiting without instruction.
- Keep them calm and cool, offer water.
- Save packaging (coffee bag, can, bottle) for exact caffeine content.
If your pet is already showing symptoms, don’t wait for a calculator result — call your vet or the ASPCA Poison Control center (888) 426-4435 immediately.
Sources & further reading
- ASPCA Animal Poison Control — pet poison database & dosage references
- Pet Poison Helpline — toxicology triage guidelines
- Merck Veterinary Manual — toxicology monographs
- Vets Now (UK) — emergency toxicosis guidance