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The short answer
Chocolate is poisonous to dogs because it contains theobromine, which dogs struggle to break down. The darker the chocolate, the more dangerous it is, and cocoa powder is the worst. Signs usually appear within two to four hours but can take up to 12 hours, according to the PDSA. If your dog has eaten chocolate, contact your vet or an out-of-hours vet now, even if your dog seems well, and keep the wrapper.
This page is not veterinary advice. It sets out what the PDSA, Blue Cross and the ASPCA publish; only your vet can judge your dog’s risk.
Why chocolate is toxic to dogs
The PDSA explains that chocolate is made with cocoa solids, which contain theobromine. It is “harmless to humans, but toxic to dogs and other pets because they struggle to metabolise it (break it down)”. Chocolate can also contain a small amount of caffeine, which the PDSA says “can be harmful to pets”.
The ASPCA groups chocolate with coffee and caffeine because the problem in all three is their methylxanthines, “a group of compounds found in these products”. Theobromine is one of them, and the PDSA describes it as “a similar substance to caffeine”.
How ill a dog becomes depends on three things, the PDSA says: how much chocolate it ate, how big the dog is, and the cocoa content of the chocolate.
Which chocolate is most dangerous
| Type | What the sources say |
|---|---|
| Cocoa powder | PDSA: “especially toxic” because of its extremely high concentration of cocoa solids. Blue Cross: “even more dangerous to your pet than dark chocolate”. |
| Dark, cooking and baking chocolate | Blue Cross: dark chocolate “is the most dangerous” of the bars; cooking chocolate “usually contains more theobromine than milk chocolate”. ASPCA: baking chocolate and cocoa powder “have the highest concentrations”. |
| Milk chocolate | Blue Cross: lower in cocoa than dark, but still worth contacting your vet. PDSA: even chocolate with less cocoa solids “can be toxic if enough is eaten”. |
| White chocolate | PDSA: no cocoa solids, “so toxicity isn’t a risk”. Blue Cross: “treatment is not required”. ASPCA: “the lowest methylxanthine content”. All three point to another risk: fat and sugar, which can cause stomach upsets and, in severe cases, pancreatitis. |
Even white chocolate is worth a call. Blue Cross warns that chocolate “may also contain other ingredients that are harmful to dogs, such as certain nuts, raisins and alcohol”. Raisins on their own are covered in can dogs eat grapes?, and sugar-free chocolate or sweets may contain the sweetener in xylitol and dogs. With a box of filled chocolates, Blue Cross notes, “it’s not easy to work out how much chocolate has been eaten”.
Signs of chocolate poisoning
The PDSA says theobromine at a toxic dose makes “the nervous system, guts, and muscles … go into overdrive”. Typical signs:
- excitement, restlessness, agitation and hyperactivity
- vomiting and diarrhoea
- drinking and weeing more than usual
- tummy pain
In severe cases the PDSA adds fast breathing or panting, shaking and tremors, a high temperature, seizures, a fast heart rate and high blood pressure. The most severe cases are “very rare” but “can lead to heart failure, coma and even death”. Blue Cross also lists “heart problems” and notes that signs “can develop even if your dog has only eaten small amounts”.
What to do if your dog ate chocolate
- Call your vet now, or an out-of-hours vet. The PDSA says “don’t wait for symptoms to appear”.
- Keep the packaging. The vet will ask for the type of chocolate, how much was eaten, your dog’s size and when it happened, the details the PDSA lists.
- Do not make your dog sick yourself. The PDSA is direct: “Don’t try to make your dog sick at home.”
- In the UK you can also call Animal PoisonLine. Blue Cross gives the number as 01202 509 000 “(charges apply)” and describes it as “a 24 hour triage advice line for pet owners run by the Veterinary Poisons Information Service (VPIS)”. It does not replace getting your dog to a vet if you are told to.
What the vet may do
The PDSA describes the treatments a vet may choose: an injection to make the dog sick if it reaches the clinic within a few hours, activated charcoal to absorb remaining toxins, a fluid drip to support vital organs, sedation if there are tremors or seizures, and close monitoring. The outlook is good with prompt care: “with the right treatment, most dogs make a full recovery”, although “chocolate poisoning can be fatal if treatment is delayed”.
Keeping chocolate away from your dog
The PDSA advises keeping all chocolate in high or locked cupboards, telling children never to share it, taking extra care at Easter and Christmas, keeping parcels away from pets and avoiding garden mulch made with cocoa shell. Blue Cross adds Halloween, “when dogs may be tempted to chew through wrapping”. Cat owners face different seasonal hazards: see lilies and cats and onions and garlic for cats.
Before you act
Read the PDSA chocolate poisoning page and the Blue Cross chocolate page, which gives the Animal PoisonLine details. The PDSA notes its advice “is for UK pets only”. If your dog has eaten chocolate, phone first and read later.
Questions about this page
How long after eating chocolate does a dog get ill?
The PDSA says signs usually appear within two to four hours but can take up to 12 hours. Do not wait for them: call your vet as soon as you know your dog has eaten chocolate.
Is white chocolate safe for dogs?
It carries little or no theobromine risk, according to the PDSA, Blue Cross and the ASPCA, but it is very fatty and sugary and can lead to pancreatitis. Blue Cross also warns that chocolates can contain raisins, nuts or alcohol, so contact your vet anyway.
Which chocolate is most dangerous for dogs?
Cocoa powder, then dark and cooking or baking chocolate. Blue Cross says cocoa powder is even more dangerous than dark chocolate, and the ASPCA says baking chocolate and cocoa powder have the highest concentrations.
Sources
- Chocolate poisoning in dogs (PDSA)pdsa.org.uk
- Can dogs eat chocolate? (Blue Cross)bluecross.org.uk
- Poisonous foods for dogs (Blue Cross)bluecross.org.uk
- Poisons and hazards for your pets (PDSA)pdsa.org.uk
- People foods to avoid feeding your pets (ASPCA Animal Poison Control)aspca.org