---
title: "Chocolate Poisoning in Dogs"
description: "Chocolate is toxic to dogs. UK theobromine bands, dark vs milk vs baking, Easter and advent risks, calculator, and Animal PoisonLine steps."
url: "https://pethealth.org.uk/health/chocolate-poisoning-in-dogs"
canonical: "https://pethealth.org.uk/health/chocolate-poisoning-in-dogs"
date_published: "2026-06-23"
date_modified: "2026-08-13"
source: "PETHEALTH+"
---

# Chocolate Poisoning in Dogs

Chocolate is toxic to dogs because of **theobromine**, which dogs metabolise slowly. **Dark and baking chocolate are most dangerous**; milk chocolate is less so but still risky in quantity. If your dog ate chocolate, call your vet or **Animal PoisonLine on 01202 509000** immediately with type, amount and weight — do not wait for symptoms. Use the chocolate calculator only as a prompt, then phone.

## Why is chocolate poisonous to dogs?

Chocolate contains **theobromine** and **caffeine**, both methylxanthines. Dogs break these down much more slowly than people, so theobromine builds up. The darker and more concentrated the chocolate, the more theobromine it contains.

This page is the clinical guide. If you only needed a yes/no, start at [can dogs eat chocolate?](/health/can-dogs-eat-chocolate-uk) — the answer is no — then come back here for dose bands and what vets do.

UK veterinary poison guidance commonly uses approximate theobromine dose bands (always confirm with your vet — individual sensitivity varies):

| Approximate theobromine dose | Typical effect |
|---|---|
| Around 20 mg/kg | Mild signs (restlessness, vomiting) possible |
| Around 40–50 mg/kg | Moderate toxicity — heart and nervous system effects |
| Around 60 mg/kg and above | Severe risk — seizures, arrhythmias; emergency |
| Around 100–200 mg/kg | Potentially life-threatening without urgent treatment |

## Chocolate types and relative risk

| Chocolate type | Relative theobromine | Rough guide for a 10 kg dog |
|---|---|---|
| Baking / unsweetened chocolate | Highest | A few squares can be dangerous |
| Dark chocolate (70%+) | High | Small amounts can cause toxicity |
| Milk chocolate | Moderate | Larger amounts needed, still risky |
| Cocoa powder / drinking chocolate | Variable, often high | Check the tin; treat as high risk |
| White chocolate | Very low theobromine | Rarely a theobromine problem; fat and sugar still cause gut upset |

UK seasonal traps: **Easter eggs**, **advent calendars**, **selection boxes**, baking cupboards, and guests’ handbags. Cocoa mulch in gardens is a separate theobromine source — keep dogs off it.

Use our [chocolate toxicity calculator](/chocolate-toxicity-calculator) for a rough estimate, then **phone your vet regardless of the result**. A “low” band is not permission to wait.

## Symptoms of chocolate poisoning

Signs usually appear within **2–12 hours** and may include:

- Vomiting and diarrhoea
- Restlessness or hyperactivity
- Increased thirst and urination
- Rapid heart rate or panting
- Muscle tremors or twitching
- Seizures (severe cases)
- Collapse

Severe poisoning can cause **heart arrhythmias** and, without treatment, can be fatal — especially in small dogs or after dark or baking chocolate.

## What to do if your dog ate chocolate

1. **Call your vet or Animal PoisonLine (01202 509000) now** — do not wait for symptoms.
2. Tell them the **type**, **approximate amount**, **time eaten**, and **weight**.
3. **Do not induce vomiting** unless a vet instructs you to.
4. Keep the **wrapper** — cocoa percentage helps.
5. Mention any **xylitol** (“sugar-free”) products in the same raid. That is a second poison — see [xylitol poisoning](/health/xylitol-poisoning-in-dogs).

If advised to go in, treatment may include induced vomiting if recent, activated charcoal, IV fluids, heart monitoring and anti-seizure medication. Out of hours use the [out-of-hours directory](/vets/filter/out-of-hours).

## What “the clinic did something” usually means

Recent ingestion in a stable dog may be decontamination first. Later presentations focus on heart rhythm, temperature, blood pressure and stopping tremors. Caffeine in chocolate adds to the stimulant load; baking chocolate and cocoa powder pack more theobromine per gram than a milk Easter egg of the same weight.

Small dogs and puppies reach toxic mg/kg faster. A “family bar” shared on the floor is not one dose — it is however many grams that animal ate. If two dogs raided the same tin, both need advice.

Do not give human heart tablets, salt, or milk as home treatment. The calculator plus the wrapper is what the phone call needs. If the amount is unknown — shredded wrapper, multiple dogs, or chocolate in a mixed dessert — say so. Unknown is still a reason to go in, not a reason to wait.

## Prevention

Keep all chocolate out of reach, including baking ingredients. Remind children and guests. If the dog is a known counter-surfer, shut the kitchen. Grapes and raisins are a different, no-safe-dose emergency — [grape poisoning](/health/grape-poisoning-in-dogs). After any confirmed chocolate ingestion, even if the clinic sends you home, watch overnight for restlessness, panting or vomiting and go back if those start. Do not give leftover anti-sickness tablets from a previous illness unless the vet says so tonight. Water is fine in small sips if they can swallow.

## FAQs

### How much chocolate will kill a dog?

It depends on the dog's weight and the chocolate type — as little as 20 g of baking chocolate can be dangerous for a small dog. Never guess; call your vet or Animal PoisonLine with the amount and type.

### How long after eating chocolate do symptoms appear?

Usually within 2–12 hours, though mild signs can take longer. Do not wait for symptoms if you know chocolate was eaten.

### Is white chocolate toxic to dogs?

White chocolate contains very little theobromine and is rarely toxic in small amounts, but high fat and sugar can still cause vomiting and pancreatitis.

### Can a dog recover from chocolate poisoning?

Yes — with prompt treatment most dogs recover well. Severity depends on dose, type of chocolate, and how quickly treatment starts.

### What if they also ate xylitol gum or a 'sugar-free' chocolate?

Treat that as a second emergency. Xylitol can cause a rapid insulin crash. Tell PoisonLine both products. See the xylitol guide.

## Sources

- [PDSA — Chocolate poisoning in dogs](https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub)
- [Veterinary Poisons Information Service (VPIS)](https://www.vpisglobal.com/)
- [Blue Cross — Foods poisonous to dogs](https://www.bluecross.org.uk/pet-advice)
- [Animal PoisonLine (UK)](https://www.animalpoisonline.co.uk/)

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