Dog Caffeine Toxicity Calculator

Enter Calculation

Dog Weight (kg)

Caffeine Ingested (mg)

Tip: a cup of brewed coffee ≈ 95 mg, an espresso shot ≈ 64 mg, a can of cola ≈ 35 mg.

Results

Caffeine Dose

9.5

mg per kg of body weight

Mild toxicity — call your vet

Dog weight	10 kg
Caffeine ingested	95 mg
Mild toxicity	≥ 9 mg/kg
Severe toxicity	≥ 40 mg/kg
Potentially lethal	≥ 150 mg/kg

This tool is for educational estimation only and is not a substitute for veterinary advice. If you suspect caffeine poisoning, contact your vet or an animal poison control center immediately.

What This Calculator Does

Caffeine is dangerous for dogs. Coffee, tea, energy drinks, soda, and chocolate all contain it, and dogs are far more sensitive to it than humans. This calculator estimates the caffeine dose per kilogram of your dog's body weight and compares it against published toxicity thresholds so you can gauge how worried to be while you contact a vet.

How to Use It

Enter your dog's weight in kilograms and the total amount of caffeine ingested in milligrams. If you don't know the exact caffeine content, estimate using common sources: a cup of brewed coffee is about 95 mg, an espresso shot about 64 mg, black tea about 47 mg, and a can of cola about 35 mg. The calculator divides the total caffeine by the weight and returns the dose in mg/kg, along with a risk band.

The Formula Explained

The math is simple division: $$\text{Dose} = \frac{\text{Caffeine (mg)}}{\text{Weight (kg)}} \quad (\text{mg/kg})$$ Toxicity is then read off reference ranges commonly cited in veterinary toxicology: mild signs (restlessness, vomiting, increased heart rate) can appear around 9 mg/kg, severe signs (tremors, seizures, dangerous arrhythmias) around 40 mg/kg, and doses near 150 mg/kg can be lethal.

Caffeine dose per kilogram of body weight maps to mild, severe, and lethal toxicity zones.

Worked Example

Suppose a 5 kg terrier drinks the equivalent of one cup of coffee (95 mg of caffeine). $$\text{Dose} = 95 \div 5 = 19 \text{ mg/kg}$$ That exceeds the 9 mg/kg mild threshold but is below the 40 mg/kg severe threshold, so this falls in the mild toxicity band — a clear reason to call your vet right away.

Different beverages contain different caffeine amounts, changing the dose a dog receives.

FAQ

Is any amount of caffeine safe for dogs? There is no safe recommended dose. Even small amounts can cause symptoms in small dogs, so treat all caffeine ingestion as a potential emergency.

What symptoms should I watch for? Restlessness, rapid breathing, a racing heart, vomiting, muscle tremors, and seizures. Signs can appear within 1–2 hours.

What should I do if my dog ingested caffeine? Don't wait for symptoms. Call your veterinarian or an animal poison control hotline immediately and have your dog's weight and the amount ingested ready.