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By Judyvein Cheng, CPCN, BRNC
Certified pet nutritionist in Singapore
QUICK ANSWER
Don't panic. Chocolate is rarely fatal, but it can make your dog very unwell. Work out what type of chocolate it was and roughly how much your dog ate, then call your vet. The darker and more bitter the chocolate, the more dangerous it is, and small dogs are at the greatest risk.
Why chocolate is harmful
Chocolate contains theobromine and a little caffeine. Dogs break these down much more slowly than we do. Together they speed up the heart rate and overstimulate the nervous system.
Baking chocolate
The most dangerous. Around 390–450mg of theobromine per 28g (1oz). Even a small amount can cause serious problems.
Dark and semi-sweet chocolate
Highly toxic. Around 150–160mg per 28g (1oz).
Milk chocolate
Less toxic, around 44–58mg per 28g (1oz), but a large amount can still cause problems, especially in small dogs.
White chocolate
Almost no theobromine, but full of fat and sugar, so still not one to share.
Foods highest in theobromine
- Unsweetened baking chocolate, liquid: 447mg per 28g (1oz)
- Unsweetened baking chocolate: 376mg per 28g (1oz)
- 70–85% dark chocolate: 228mg per 28g (1oz)
- 60–69% dark chocolate: 179mg per 28g (1oz)
- Hot cocoa: 170mg per cup
- Dark chocolate-covered coffee beans: 147mg per 28g (1oz)
- Cocoa powder: 142mg per tablespoon
- 45–59% dark chocolate: 140mg per 28g (1oz)
- Semi-sweet chocolate chips: 138mg per 28g (1oz)
- Chocolate wafers: 21mg per wafer
Watch out in Singapore homes: Milo and other chocolate malt drinks, cocoa-flavoured festive cakes and kueh, and coffee all contain theobromine or caffeine. Keep cups and plates out of reach.
What to do if your dog eats chocolate
Stay calm and remove any remaining chocolate.
Identify the type: baking, dark, milk or white. Keep the wrapper if you can.
Estimate how much your dog ate, and note your dog's weight.
Watch for signs (listed below).
Call your vet if the amount is concerning, if any signs appear, or if you're simply worried. Tell them the type of chocolate, the amount, and your dog's size, breed and medical history. They may ask you to come in.
How much is too much? Mild signs can start at around 20mg of theobromine per kg of body weight. Serious heart signs appear at around 40–50mg per kg, and seizures at around 60mg per kg.
For example, a 5kg dog could show mild signs after just 12g (less than half an ounce) of 70% dark chocolate, and a full 28g (1oz) reaches the level for serious heart signs. Around 1 ounce of milk chocolate per pound of body weight (about 60g per kg) is potentially lethal, so a whole milk chocolate bar can be dangerous for a small dog.
When in doubt, err on the side of caution and call your vet.
Signs of chocolate toxicity
✓ Signs of discomfort or restlessness
✓ Vomiting
✓ Diarrhoea
✓ Fast heartbeat
✓ Hyperactivity
✓ Tremors or seizures
✓ Muscle rigidity
Signs usually appear within 6–12 hours and can last for a day or more.
Holistic support
Only with your vet's guidance:
✓ Activated charcoal binds toxins in the stomach and limits how much is absorbed.
✓ 3% hydrogen peroxide is sometimes used to make a dog vomit. It can irritate the stomach and isn't right for every dog, so never give it without your vet's instructions.
Safe to do at home:
✓ Hydration: encourage your dog to drink water to help flush out toxins.
✓ Ginger tea: a small amount of plain ginger tea, with no sugar or additives, can help soothe the stomach.
Afterwards: once your dog has recovered, help their gut settle. Adored Beast Gut Soothe contains herbs and nutraceuticals that calm the digestive tract. Follow it with a probiotic such as Fido's Flora. I recommend rotating probiotics between brands. Read more in why your dog needs a dog-specific probiotic.
A safe alternative: carob
Some dog treats look like chocolate or have chocolate-sounding names. Check the ingredients for carob. It's often mistaken for chocolate, but it's safe for dogs because it doesn't contain theobromine.
Keep chocolate well out of reach, especially during festive seasons when there's more of it around the house. If you'd like to share a treat, there are plenty of healthy foods you can share with your dog instead, like the ones in festive treats for dogs.
Frequently asked questions
My dog ate a tiny piece of milk chocolate. Should I worry?
A small piece of milk chocolate is unlikely to harm a medium or large dog, but watch for signs and call your vet if you're unsure, especially for small dogs.
Is chocolate toxic to cats too?
Yes. Cats are just as sensitive to theobromine, though they're less likely to eat it.
Is cocoa shell mulch dangerous?
Yes. Cocoa shell garden mulch contains theobromine too, and some dogs love the smell.
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This article is for educational purposes and isn't a substitute for veterinary care. If you're concerned about your pet's health, please seek professional advice.
ABOUT THE AUTHOR
Judyvein Cheng, CPCN, BRNC
Judyvein is a Certified Professional Canine Nutritionist and Certified Raw Nutrition Coach for Cats & Dogs, and the founder of JOOF Holistic Pet. Her journey began with her Frenchie, Wangcai, and today she helps pet parents in Singapore take a root-cause approach to their pets' health.
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