My dog ate chocolate: what to do based on how much
Guide summary
- Typical cost
- $107-$246
- Reading time
- 4 min
- Sources
- 4
- Updated
Call your vet, an emergency vet or a pet poison hotline as soon as you know your dog ate chocolate, even if they seem fine. Symptoms can take 6 to 12 hours to appear, and treatment is much simpler and cheaper in the first few hours.
Why chocolate is toxic to dogs
Chocolate contains theobromine (and some caffeine), which dogs break down very slowly. It builds up in their body and affects the heart, the nervous system and the kidneys. The darker and purer the chocolate, the more theobromine it has and the more dangerous it is.
How much chocolate is dangerous
According to the Merck Veterinary Manual, mild symptoms can appear from about 20 mg of theobromine per kilogram of body weight (about 9 mg per pound), heart problems from 40-50 mg/kg (18-23 mg per pound), and seizures from about 60 mg/kg (27 mg per pound).
Theobromine content varies a lot by type of chocolate. These are approximate figures:
| Type of chocolate | Approximate theobromine | Danger |
|---|---|---|
| White chocolate | Almost none | Low (but lots of fat and sugar) |
| Milk chocolate | ~65 mg per ounce | Medium |
| Dark or semisweet chocolate | ~155 mg per ounce (more with higher cocoa %) | High |
| Unsweetened baking chocolate | ~440 mg per ounce | Very high |
| Dry cocoa powder | ~800 mg per ounce | Very high |
Rough example for a 22-lb dog: about 3 ounces of milk chocolate or about 1.25 ounces of dark chocolate can already cause symptoms. A 9-lb dog can get sick from about half an ounce of dark chocolate.
These figures are only a guide. Dogs vary in sensitivity, and many products mix chocolate with other toxins (raisins, macadamia nuts, xylitol). Don't decide on your own whether it's dangerous: call your vet with the package in hand.
What to do right now
- Work out what your dog ate: type of chocolate, roughly how much and when. Keep the wrapper.
- Note your dog's weight.
- Call your vet, a 24-hour emergency hospital or a pet poison hotline: the ASPCA Animal Poison Control Center at (888) 426-4435 (a consultation fee may apply) or Pet Poison Helpline at (855) 764-7661 ($89 per incident). With these details, they'll tell you whether to go in.
- Don't make your dog vomit at home with salt water, hydrogen peroxide or other remedies unless a vet specifically tells you to. They can cause serious harm.
Symptoms of chocolate poisoning
They usually appear 6 to 12 hours after eating it and can last one to three days:
- Vomiting and diarrhea.
- Extreme thirst and peeing more than usual.
- Restlessness, hyperactivity, panting.
- A racing or irregular heartbeat.
- Tremors, muscle stiffness.
- In severe cases: seizures, collapse and, rarely, death.
How the vet will treat it
If your dog ate it recently (ideally within the last 2 hours) and has no symptoms yet, the usual step is to induce vomiting with a safe medication. With very large amounts, the vet may also give activated charcoal. If symptoms have started, your dog may need IV fluids, heart or seizure medication, and monitoring for 24-72 hours. With prompt treatment, most dogs recover well.
What it can cost
It depends on the hospital and what your dog needs. On top of the emergency exam ($107-$246, average $135), add the medication to induce vomiting and, if needed, bloodwork (about $104-$164 per panel). If your dog needs to stay in the hospital (about $619 at a regular clinic, $1,323 at an emergency hospital on average), the total can easily pass $1,000 (Synchrony/CareCredit 2025-2026 cost study). If unexpected bills like this worry you, read is pet insurance worth it?
How to prevent it
- Keep chocolate, candy and baked goods out of reach, especially around Halloween, Christmas, Valentine's Day and Easter.
- Tell kids and guests not to give your dog chocolate.
- Learn the other foods dogs can't eat.
Frequently asked questions
My dog ate chocolate and seems fine. Can I relax?
Not necessarily. Symptoms can take up to 12 hours to appear. Call your vet anyway: if the amount is dangerous, it's better to treat it before symptoms start.
Is white chocolate dangerous for dogs?
It has almost no theobromine, so the risk of poisoning is low. But it's high in fat and sugar, which can cause vomiting, diarrhea and even pancreatitis in some dogs.
What if my dog only ate one chocolate chip cookie?
One cookie with a little milk chocolate usually isn't dangerous for a medium or large dog. But if your dog is small, if the cookie has dark chocolate, or if it contains raisins, macadamia nuts or xylitol, call your vet.
Sources
This article is for general information and does not replace diagnosis or treatment by a veterinarian. If you are worried about your pet's health, call your vet clinic.
