Can dogs eat caffeine?
UNSAFE Category: Drink · Source verified September 2026
Coffee, tea, energy drinks and coffee grounds all contain methylxanthines that stimulate the canine nervous system dangerously. Caffeine is absorbed quickly, so symptoms can start within 30 minutes of a dog raiding the coffee pod bin. There is no safe threshold worth testing — keep all caffeinated products out of reach.
How much is dangerous?
- The reported median lethal dose of caffeine in dogs is about 140 mg/kg (published range 100–200 mg/kg) — but racing heart and tremors appear at much lower doses.
- An 8 oz cup of brewed coffee holds roughly 80–100 mg of caffeine, below the danger zone for most mid-size dogs; the concentrated forms are the emergencies: espresso powder, energy drinks, caffeine pills and used coffee grounds.
- Caffeine and theobromine are both methylxanthines and compound each other — which is why chocolate-covered espresso beans are a classic poison-control call.
Dose data: Tawde et al., J Med Toxicol (2012) · Merck Veterinary Manual: Chocolate Toxicosis (methylxanthines).
Symptoms to watch for
- restlessness
- rapid breathing
- heart palpitations
- muscle tremors
- seizures
If you suspect poisoning: call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 (available 24/7). Do not induce vomiting unless instructed by a professional.
Quick answers
Can dogs eat caffeine?
No. Coffee, tea, energy drinks and coffee grounds all contain methylxanthines that stimulate the canine nervous system dangerously. Caffeine is absorbed quickly, so symptoms can start within 30 minutes of a dog raiding the coffee pod bin. There is no safe threshold worth testing — keep all caffeinated products out of reach.
How much caffeine is toxic to a dog?
The reported median lethal dose is about 140 mg of caffeine per kg of body weight (range 100–200 mg/kg), but racing-heart and tremor signs appear well below it. Concentrated forms — pills, energy drinks, espresso powder, coffee grounds — cause the real emergencies.
What are the symptoms if my dog eats caffeine?
Watch for restlessness, rapid breathing, heart palpitations, muscle tremors, seizures. Symptoms may appear within hours. When in doubt, call your vet.
What should I do if my dog ate caffeine?
Call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 right away. Do not wait for symptoms — early treatment is dramatically cheaper and safer.
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Source: ASPCA Animal Poison Control. This page is informational and is not veterinary advice.