Quantity
Toxic effects can begin at around 20mg of caffeine per kilogram of body weight. An 8oz cup of coffee has about 95mg of caffeine; an espresso shot has about 63mg. Coffee grounds are much more concentrated — a tablespoon of used grounds can contain 60–100mg.
Notes
Coffee grounds are the most common dangerous exposure because dogs get into the kitchen trash. A single caffeine pill can contain 100–200mg of caffeine, which is a serious dose for any dog. Tea bags, energy drinks, and pre-workout supplements are also sources. Even dark chocolate combines theobromine AND caffeine for a double hit.
Negative Signs
* Restlessness and hyperactivity that seems extreme
* Rapid or irregular heartbeat (you can feel it through their chest)
* Panting and elevated body temperature
* Muscle tremors
* Vomiting and diarrhea
* Seizures in severe cases
* Collapse
FAQ
Q: My dog drank some of my coffee that I left on the table. How worried should I be?
A: For a large dog who had a few laps, probably not an emergency — but watch for restlessness, panting, and rapid heartbeat. For a small dog, or if they drank a significant amount, call your vet. Coffee grounds are much more dangerous than brewed coffee.
Alternatives
If you want a warm drink ritual with your dog, a splash of warm low-sodium bone broth is a cozy, safe alternative.
Risks & Disclaimer
If your dog ate coffee grounds, caffeine pills, or tea bags, call your vet or poison control immediately. Coffee grounds and caffeine pills are the most dangerous because they're concentrated. A dog who lapped up some spilled coffee is less urgent but still worth monitoring.
