Is chocolate toxic to cats?
Yes. Chocolate contains theobromine and caffeine, which cats handle poorly, and the danger depends on the type, the amount and your cat's weight. Cats rarely eat much because they cannot taste sweetness, but around 7 g of dark chocolate is already enough to need a vet for a 4 kg cat, and baking chocolate or cocoa powder far less. Work out what was eaten and call your vet today.
General information, not veterinary advice. If your pet may have eaten this, contact a vet now; do not wait for signs.
What to do right now
- Take any remaining chocolate away and keep the wrapper
- Work out the type (milk, dark, baking, cocoa) and roughly how many grams are missing
- Weigh your cat or use the last known weight
- Call your vet now with the type, amount and weight
- Do not try to make your cat sick at home
Go to an emergency clinic now if
- Dark chocolate, baking chocolate or cocoa powder was eaten, or you cannot tell how much
- Your cat is restless, panting or has a racing heartbeat
- Muscle twitching, trembling or a seizure
- Repeated vomiting or collapse
- The chocolate also contained raisins, nuts, alcohol or a sweetener
Who to call
Your own vet first. If they are closed, the nearest emergency or out-of-hours clinic.
In the United States
Both answer 24 hours a day and may charge a consultation fee.
Signs to watch for
| Sign | Usually starts |
|---|---|
| Vomiting and diarrhoea | 2-12 hours |
| Increased thirst and urination | 2-12 hours |
| Restlessness, panting, hyperactivity | 2-12 hours |
| Fast or irregular heartbeat | Several hours, larger amounts |
| Muscle tremors | Several hours, larger amounts |
| Seizures | Severe cases; signs can last up to 72 hours |
Why is chocolate toxic to cats?
Chocolate is toxic to cats because it contains theobromine and caffeine, two stimulants that raise heart rate and blood pressure and excite the nervous system. Cats break these compounds down differently from people, which makes them more sensitive to the same amount.
Theobromine is the main stimulant in cocoa. The darker and more bitter the chocolate, the more theobromine it carries. Fat and sugar in chocolate add a second, separate risk of stomach upset and, occasionally, pancreatitis.
Why do cats get chocolate poisoning less often than dogs?
Cats lack a working sweet-taste receptor, so they are not drawn to chocolate the way dogs are. A 2005 genetic study found that the gene for one half of the sweet receptor is inactive in cats. Cats still eat chocolate out of curiosity, licking cocoa from a mug or chewing a brownie, and the dose maths is the same as for any animal: grams eaten, type, body weight.
How much chocolate is dangerous for a cat?
The risk is measured in milligrams of theobromine per kilogram of body weight. Pativo uses these levels: from 10 mg/kg a vet should see your cat soon; around 20 mg/kg mild signs are expected (vet today); around 40 mg/kg the heart is affected (emergency); from 60 mg/kg seizures become likely. These bands come from veterinary guidance for dogs; no separate published figures exist for cats, so vets apply the same ones.
Pativo's theobromine figures per gram are 2.4 mg for milk chocolate, 5.5 mg for dark and 16 mg for baking chocolate. For an average 4 kg cat, this is roughly how much chocolate reaches each level:
| Level for a 4 kg cat | Milk chocolate | Dark chocolate | Baking chocolate |
|---|---|---|---|
| 10 mg/kg: see a vet soon | about 17 g | about 7 g | about 2.5 g |
| 20 mg/kg: mild signs, vet today | about 33 g | about 15 g | about 5 g |
| 40 mg/kg: heart effects, emergency | about 67 g | about 29 g | about 10 g |
| 60 mg/kg: seizures likely | about 100 g | about 44 g | about 15 g |
Cocoa powder is stronger again: the Merck Veterinary Manual lists about 28.5 mg of stimulants per gram, so a heaped teaspoon can matter for a cat. White chocolate carries almost none. A lighter cat or a kitten reaches each level with less.
What will the vet do?
The vet first calculates the likely dose from the type, the amount and your cat's weight. If the chocolate was eaten recently, usually within about two hours, and your cat has no signs yet, the vet may make your cat vomit with an injection and give activated charcoal. Cats that show signs may need fluids, heart monitoring and medicine to control vomiting, tremors or a fast heartbeat. Theobromine stays in the body a long time, so signs can last up to three days in severe cases.
How do I stop it happening again?
Keep chocolate, cocoa powder, hot chocolate mix and baked goods in closed cupboards, not on counters a cat can jump onto. Do not leave mugs of cocoa unattended. Remember that festive chocolate, advent calendars and baking ingredients are the usual culprits. If you share your home with a dog as well, the chocolate guide for dogs covers their larger risk.
When you are unsure whether something is dangerous, Pativo's toxin lookup and photo poison check compare it with the app's own toxin list; the lookup runs on your phone and works offline.
Questions owners ask
Is white chocolate dangerous for cats?
White chocolate has almost no theobromine, so poisoning is very unlikely. Its fat and sugar can still cause vomiting or diarrhoea, so tell your vet if your cat ate a lot.
My cat licked a little chocolate. Is that an emergency?
A lick of milk chocolate is very unlikely to reach a toxic dose for an adult cat. A lick of cocoa powder or baking chocolate is different, so call your vet with the product and an estimate of the amount.
Can chocolate poisoning kill a cat?
It is rarely fatal, but large doses can cause heart rhythm problems and seizures. Early treatment makes recovery faster, easier and cheaper.
Sources
- VCA Animal Hospitals: Chocolate Poisoning in Cats
- Merck Veterinary Manual: Chocolate Toxicosis in Animals
- PDSA: Chocolate Poisoning in Cats
- Li et al. (2005), PLoS Genetics: Pseudogenization of a sweet-receptor gene accounts for cats' indifference toward sugar
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