Stay calm. Gather information. Call your vet. If your dog has eaten chocolate, you need to act quickly but clearly. The sooner your dog receives treatment, the better the outcome. Call your vet or the Animal PoisonLine on 01202 509000 right now.
Most dogs recover fully from chocolate ingestion when treated promptly. You are doing the right thing by looking this up. Now follow the steps below.
Step-by-Step: What to Do Right Now
Do these five things in order. If someone else is with you, have them call the vet while you gather information.
1. Remove any remaining chocolate from your dog's reach. Take the chocolate away immediately. If there are wrappers, pieces, or crumbs left, move them somewhere your dog cannot access. Do not waste time cleaning up — just secure it and move on.
2. Work out what they ate and how much. Check the packaging, wrapper, or box. Try to estimate how much is missing. If your dog ate an entire bar, note the weight from the label. If you are unsure, overestimate rather than underestimate. The type of chocolate matters enormously — dark chocolate and cocoa powder are far more dangerous than milk chocolate.
3. Note the time. Try to work out when your dog ate the chocolate. Was it in the last 30 minutes? The last 2 hours? Earlier today? If you are unsure, estimate when you last saw the chocolate intact. This information is critical because vets can induce vomiting within approximately 2 hours of ingestion, before the theobromine is fully absorbed.
4. Weigh your dog if you can. If you have scales and can quickly weigh your dog, do so. If not, use your best estimate. Your vet needs your dog's weight to calculate whether the amount consumed is dangerous. If your dog's weight is stored in the SafeBowl app, check it there.
5. Call your vet immediately. Phone your vet surgery. If it is outside opening hours, call your nearest emergency veterinary clinic. You can also call the Animal PoisonLine on 01202 509000 — they provide expert toxicology advice 24 hours a day, 7 days a week (a fee applies per case).
Do not wait to see if symptoms appear before calling your vet. Chocolate poisoning symptoms can take several hours to develop, and by that point treatment is more difficult. Early action saves lives.
Information Your Vet Will Need
When you call, have this information ready. It helps your vet assess the risk quickly and advise you on the best course of action:
- Type of chocolate — dark chocolate, milk chocolate, white chocolate, cocoa powder, or baking chocolate. Check the wrapper or packaging for the cocoa percentage if possible.
- Amount eaten — in grams or by description (for example, "half a 100g bar" or "three chocolates from a box"). Overestimate if you are unsure.
- Your dog's weight — in kilograms. Even a rough estimate is helpful.
- Time of ingestion — when your dog ate the chocolate, or your best estimate of the window.
- Any symptoms so far — vomiting, restlessness, panting, diarrhoea, or anything unusual.
- Your dog's breed and age — some breeds and older dogs may be more vulnerable.
Take a photo of the chocolate wrapper or packaging before you throw it away. This gives your vet exact information about the cocoa content and quantity, and you can refer back to it if needed.
Symptoms to Watch For
Chocolate contains theobromine and caffeine, both of which are toxic to dogs. Dogs metabolise theobromine far more slowly than humans — it stays in their system for roughly 17.5 hours. Symptoms develop in stages depending on the amount and type consumed.
Within 1-2 hours:
- Vomiting (often the first sign)
- Restlessness or hyperactivity
- Excessive panting
- Increased thirst and urination
Within 6-12 hours:
- Diarrhoea
- Rapid heart rate
- Muscle tremors or twitching
- Excessive drooling
- Abdominal discomfort or bloating
Within 12-24 hours (severe cases):
- Seizures
- Irregular or abnormally fast heartbeat
- Difficulty breathing
- Collapse
- In the most severe cases, heart failure
Symptoms can worsen suddenly even many hours after ingestion because theobromine is metabolised so slowly. If your dog seems fine initially, continue monitoring closely for at least 24 hours. Do not assume they are in the clear.
Write down any symptoms you observe and the time they started. This timeline is extremely valuable for your vet and helps them monitor your dog's progression and response to treatment.
How Dangerous Is It?
The danger depends on three factors: the type of chocolate, the amount consumed, and your dog's body weight. Use this quick reference to gauge the severity, but always contact your vet regardless.
Cocoa powder — extremely dangerous. Contains approximately 800 mg of theobromine per ounce (28g). Even a tablespoon can cause serious symptoms in a small dog. This is a veterinary emergency.
Baking chocolate (unsweetened) — extremely dangerous. Contains approximately 450 mg of theobromine per ounce. Small quantities can be life-threatening, particularly for dogs under 10 kg.
Dark chocolate (70%+ cocoa) — very dangerous. Contains approximately 150-300 mg of theobromine per ounce. A single square can be hazardous for a small dog. A full bar is dangerous for dogs of any size.
Milk chocolate — moderately dangerous. Contains approximately 44-60 mg of theobromine per ounce. Larger quantities are needed to reach toxic levels, but it can still cause serious illness, especially in smaller dogs.
White chocolate — low theobromine risk. Contains negligible theobromine (approximately 0.25 mg per ounce). Unlikely to cause theobromine poisoning, but the high fat and sugar content can cause pancreatitis and significant digestive upset. Still worth reporting to your vet.
As a general guideline, theobromine becomes toxic at approximately 20 mg per kilogram of your dog's body weight. Severe poisoning occurs at 40-60 mg/kg. However, individual dogs vary in sensitivity, and there is no truly safe amount. When in doubt, treat it as an emergency.
Do not rely on online chocolate toxicity calculators as a substitute for professional veterinary advice. They can provide a rough estimate, but only your vet can properly assess your dog's risk and determine the right treatment.
Treatment and Recovery
What your vet will do depends on timing.
If your dog is seen within approximately 2 hours of eating the chocolate, the vet will most likely induce vomiting to remove as much chocolate as possible before it is fully digested. This is the single most effective intervention and is why calling your vet quickly is so important.
Following induced vomiting, or if more time has passed, your vet may administer activated charcoal. This binds to theobromine in the digestive tract and reduces the amount absorbed into the bloodstream. Multiple doses may be given over several hours.
For more serious cases, treatment may include:
- Intravenous (IV) fluids to support kidney function and help flush theobromine from the body
- Anti-seizure medication if tremors or seizures are present
- Heart monitoring to detect and treat abnormal heart rhythms
- Sedation if the dog is severely agitated or restless
In severe poisoning cases, dogs may need to be hospitalised for 24 to 72 hours for monitoring and supportive care.
The good news: most dogs recover fully with prompt treatment. According to the ASPCA Animal Poison Control Center, chocolate toxicosis has a good prognosis when treated early. The vast majority of dogs who receive timely veterinary care make a complete recovery.
After your dog is treated and sent home, follow your vet's aftercare instructions carefully. This usually means a bland diet for 24-48 hours, rest, and monitoring for any return of symptoms. Keep your vet's number to hand during the recovery period.
Going forward, store all chocolate, cocoa powder, and baking supplies in sealed containers in cupboards your dog cannot reach. Be especially careful at Christmas, Easter, Valentine's Day, and Halloween when chocolate is more accessible around the home. Educate everyone in your household — especially children — that chocolate is never safe to share with dogs, no matter how small the piece.
You found this page because you care about your dog. That matters. Call your vet now if you have not already, follow their advice, and know that acting quickly gives your dog the best possible chance of a full recovery.