My Dog Ate Chocolate: Toxicity Estimates and What to Do Now

No interactive calculator is provided on this page. Call a veterinarian or animal poison helpline with the chocolate type, amount, time eaten and your dog's weight; do not delay care to calculate a dose.

If your dog just ate chocolate, stay calm and act quickly. Chocolate contains theobromine and caffeine, which dogs cannot process well. Whether it becomes dangerous depends on the type of chocolate, how much was eaten and your dog's weight. This guide is general information. When in doubt, call a vet or poison helpline right away.

What to do right now

Take the chocolate away and note what remains, including the wrapper
Work out what was eaten: type, amount and about when
Know your dog's weight
Call a vet, an emergency clinic or a poison helpline: the ASPCA Animal Poison Control Center at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661 (fees may apply)
Do not make your dog vomit unless a vet tells you to
Go where you are told, and bring the packaging

Do not wait for symptoms. Signs can take hours to appear.

Which chocolate is most dangerous?

Theobromine content varies a lot. From least to most concentrated:

White chocolate: very little theobromine, though high fat can still upset the stomach
Milk chocolate: low to moderate
Semi-sweet and dark chocolate: much higher
Baking chocolate and cocoa powder: the most concentrated, so small amounts can be dangerous

Approximate theobromine amounts are roughly 60 mg per ounce for milk chocolate, 150 mg per ounce for semi-sweet and 400 mg per ounce for baking chocolate, though products differ. Treat these as rough estimates.

How to estimate the risk

Veterinary references commonly describe these approximate theobromine levels per kilogram of body weight:

About 20 mg/kg: mild signs may appear, such as vomiting and restlessness
About 40 to 50 mg/kg: heart effects can occur
About 60 mg/kg or more: seizures are possible

To estimate, convert your dog's weight to kilograms (pounds divided by 2.2), then compare the theobromine in the amount eaten against those numbers. For example, a 22 lb (10 kg) dog that ate one ounce of baking chocolate may have taken in about 400 mg, or 40 mg/kg, which is in the range that needs urgent veterinary care. This is a rough guide and not a substitute for professional advice. Small amounts of milk chocolate in a large dog may be low risk, but call to confirm.

Signs of chocolate poisoning

Vomiting and diarrhea
Restlessness and hyperactivity
Increased thirst and urination
Fast or irregular heartbeat
Tremors or seizures
Collapse

If you see these signs, go to an emergency clinic now.

What a vet may do

Treatment depends on timing and amount. A vet may induce vomiting if appropriate, give activated charcoal, provide fluids and monitor the heart.

Prevent chocolate emergencies

Store chocolate, baked goods and cocoa where dogs cannot reach, and remind guests during holidays.

For suspected chocolate ingestion, call your veterinarian, an emergency clinic or a poison helpline immediately; do not wait for a Waggle Vet chat response. Use the clinic directory to locate nearby care and call to confirm it can receive your dog.

FAQs

How much chocolate is toxic to a dog?

It depends on the type and your dog's size. Call for advice with the details.

My dog ate a small piece of milk chocolate. Should I worry?

Often the risk is low, but check with a vet or poison helpline.

How long does chocolate poisoning last?

Effects can last a day or more, so follow your vet's advice.

Service limits and further guidance

Chocolate risk estimates must not be used to rule out poisoning. Caffeine also contributes to toxicity, products vary and individual susceptibility differs. Call a veterinarian or poison helpline immediately after a suspected ingestion, even before symptoms.

Merck Veterinary Manual: chocolate toxicosis

Sources checked October 14, 2026. These references do not constitute veterinary review or endorsement of this article.