FrançaisCan cats eat chocolate?
No. Chocolate contains theobromine and caffeine, and both can poison cats as well as dogs [1, 4]. If your cat has eaten or licked chocolate, or anything made with cocoa, call your vet or a pet poison line now, even if your cat seems fine.
Cats rarely get into chocolate. They lack a working sweet-taste receptor: the Tas1r2 gene, one of the two genes needed to sense sugar, is a broken “pseudogene” in cats, so they do not seek out sweet foods and may not taste sweetness at all [3]. Cats are also more selective eaters than dogs [5].
The poison-line figures reflect this. In US calls to the ASPCA Animal Poison Control Center from 2005 to 2014, chocolate was the most common exposure in dogs, while lilies were the most common in cats [7]. At the Kansas State poison line, chocolate and cocoa products were the most reported foods, but cats made up 4.2% of these food calls against 33.5% for dogs [6]. Few cats are affected, so there is no published case series of chocolate poisoning in cats: most of what follows comes from general references and dog studies, and is labeled as such.
Why chocolate is dangerous: theobromine and caffeine
Theobromine and caffeine belong to a family of stimulants called methylxanthines. Chocolate contains 3 to 10 times more theobromine than caffeine, and both contribute to poisoning [1]. They block adenosine receptors, which stimulates the brain, speeds up the heart and increases urine output. They also raise calcium inside muscle cells, so heart and skeletal muscles contract harder [1].
The amount varies with the type of chocolate. Figures from the Merck Veterinary Manual [1]:
| Product | Methylxanthines (theobromine + caffeine) |
|---|---|
| Cocoa powder | About 28.5 mg per gram |
| Unsweetened baking chocolate | About 15.5 mg per gram |
| Semisweet and dark chocolate | About 5.3 to 5.6 mg per gram |
| Milk chocolate | About 2.3 mg per gram |
| White chocolate | About 0.04 mg per gram (negligible) |
- Where it hides: chocolate bars and candy, brownies, cakes and other chocolate baked goods, chocolate milk, chocolate syrup, hot cocoa, cocoa powder, and chocolate-covered nuts or espresso beans [10].
- Coffee and caffeine: coffee, caffeine and chocolate carry the same kind of risk, because all contain methylxanthines [11]. Caffeine is also found in tea, guarana, soft drinks and some medicines [4].
- Other ingredients: candy and baked goods may also contain macadamia nuts, raisins or xylitol [10]. The high fat content of chocolate may also trigger pancreatitis in susceptible animals [1].
What to do, and when signs appear
Call your vet or a pet poison line right away, even if your cat seems well, and note the type of chocolate, how much may be missing and when it happened. In a study of 156 dogs, the type and amount of chocolate and the time since it was eaten were the key facts for the vet [8]. Do not try to make your cat vomit at home. The Merck Veterinary Manual lists hydrogen peroxide for dogs only; for cats, it lists an injected medicine given by the vet [1].
In dogs, mild signs have been reported from about 20 mg of methylxanthines per kg of body weight, heart effects from 40 to 50 mg/kg and seizures from 60 mg/kg [1]. No comparable figures have been published for cats. Call your vet or a pet poison line whatever the amount.
- When: signs usually start 6 to 12 hours after eating [1, 2]. In severe cases they can last up to 72 hours [1, 5].
- First signs: thirst, vomiting, diarrhea, a swollen belly and restlessness [1].
- Then: hyperactivity, more urine, wobbliness, stiff muscles, tremors and seizures [1, 2].
- Heart and body: a fast or irregular heartbeat, fast breathing, high blood pressure, high body temperature and, in severe cases, collapse or coma [1, 2]. Death, when it happens, is usually due to heart rhythm problems, overheating or breathing failure [1].
What the vet checks, and why
There is no quick blood or urine test that confirms chocolate poisoning. The diagnosis rests on the history and the signs, and the vet also considers other stimulants, such as some human medicines and drugs [1]. Tests are used to measure the effects on the body and to guide care.
- Abbreviation K or potassium, in the electrolyte block with sodium (Na) and chloride (Cl).
- Result 3.2 mmol/L in this illustrative line: mildly low. Low potassium has been described in methylxanthine poisoning, sometimes late in the course [1].
- Unit mmol/L or mEq/L: the same number for potassium.
- Laboratory interval The example uses the cat interval of the Merck Veterinary Manual [12]; each laboratory sets its own.
- Flag L: below the interval. Your vet reads it with the heart rate and the ECG, because low potassium can add to heart rhythm problems [1].
| Check | What can be found | Why it matters |
|---|---|---|
| Heart rate and ECG | Fast heart rate, extra beats, sometimes a slow rate | Heart rhythm problems are the main danger; the ECG is used to monitor them [1] |
| Body temperature | High | Overheating is one of the causes of death [1] |
| Potassium | Low | Low potassium may appear late and adds to heart problems [1]; found in 16 of 34 dogs tested [8] |
| Glucose | Mildly high | Found in 16 of 34 dogs tested [8] |
| Lactate | High | The most frequent lab change in dogs: 23 of 34 [8] |
| Liver enzymes (ALT, AST) | Mildly high | Found in 14 of 34 dogs tested [8] |
| Sodium and hydration | Dehydration; high sodium after charcoal | The stimulants increase urine; high sodium has been reported after activated charcoal, especially with chocolate [1] |
Care is supportive: the vet may make the cat vomit if it is still well and the chocolate was eaten recently, then use fluids, medicines to calm tremors and control the heart rate, and heart monitoring [1]. Fluids also help the kidneys clear the stimulants into the urine [1]. To read the rest of the panel, see cat blood work explained.
Outlook
No study has followed the outcome of cats after chocolate. In dogs, the outlook is good with prompt care: in 156 dogs, 44 had signs and 43 of those 44 survived [8]. Early decontamination can reduce how severe the signs become [1].
For cats poisoned by any substance, a German emergency study of 166 cats found a survival rate of 88.6% [9]. Other toxic risks for cats include lilies; see the overview of toxic foods for dogs and cats.
Related articles
Other foods: avocado for dogs and cats.
En français : chocolat et chat.
Questions to ask your veterinarian
- Given the type and amount of chocolate, how much risk is there for my cat?
- Is my cat’s heart rate normal, and does it need an ECG?
- Is the potassium normal, and will it be rechecked?
- How long should my cat be watched, at the clinic or at home?
- Which signs mean I should bring my cat back right away?
Get your cat’s blood results explained together.
AI DiagAnimals reads potassium, glucose, liver enzymes and the rest of the panel together with your laboratory’s intervals, and prepares the questions for your vet. The service opens soon: leave your email to be told first.
Frequently asked questions
Can cats have Nutella?
No. Nutella lists cocoa among its ingredients [13], and cocoa is a source of theobromine and caffeine [1]. Spreads are also fatty, and the fat in chocolate products may trigger pancreatitis [1]. If your cat ate or licked some, call your vet or a pet poison line whatever the amount.
Can cats eat Oreos?
No. Chocolate cookies are chocolate baked goods, which poison lines list among sources of theobromine and caffeine [10]. Cats may not even taste the sweetness [3]. If your cat ate some, call your vet or a pet poison line.
What happens if a cat eats chocolate?
Signs usually start 6 to 12 hours later: thirst, vomiting, diarrhea and restlessness, then a fast heart rate, tremors and, in severe cases, seizures [1]. They can last up to 72 hours [1]. Call your vet or a pet poison line right away, before signs appear.
Is a small amount of chocolate dangerous for a cat?
It can be. No safe amount has been published for cats. In dogs, mild signs have been reported from about 20 mg of methylxanthines per kg, and dark chocolate and cocoa powder contain much more than milk chocolate [1]. Call your vet or a pet poison line whatever the amount.
Sources
- Hayes C. Chocolate Toxicosis in Animals. Merck Veterinary Manual, reviewed 2024. merckvetmanual.com/toxicology/food-hazards/chocolate-toxicosis-in-animals
- Gwaltney-Brant SM. Food Hazards (pet owner version). Merck Veterinary Manual. merckvetmanual.com/special-pet-topics/poisoning/food-hazards
- Li X et al. Pseudogenization of a sweet-receptor gene accounts for cats’ indifference toward sugar. PLoS Genet. 2005;1(1):27-35. doi.org/10.1371/journal.pgen.0010003
- Cortinovis C, Caloni F. Household Food Items Toxic to Dogs and Cats. Front Vet Sci. 2016;3:26. doi.org/10.3389/fvets.2016.00026
- Kovalkovičová N et al. Some food toxic for pets. Interdiscip Toxicol. 2009;2(3):169-176. doi.org/10.2478/v10102-009-0012-4
- Mahdi A, Van der Merwe D. Dog and cat exposures to hazardous substances reported to the Kansas State Veterinary Diagnostic Laboratory: 2009-2012. J Med Toxicol. 2013;9(2):207-211. doi.org/10.1007/s13181-013-0289-8
- Swirski AL et al. Companion animal exposures to potentially poisonous substances reported to a national poison control center in the United States in 2005 through 2014. J Am Vet Med Assoc. 2020;257(5):517-530. doi.org/10.2460/javma.257.5.517
- Weingart C, Hartmann A, Kohn B. Chocolate ingestion in dogs: 156 events (2015-2019). J Small Anim Pract. 2021;62(11):979-983. doi.org/10.1111/jsap.13329
- Markert C et al. A retrospective evaluation of confirmed and suspected poisonings in 166 cats between 2016 and 2020. Vet World. 2023;16(9):1940-1951. doi.org/10.14202/vetworld.2023.1940-1951
- Pet Poison Helpline. Chocolate. petpoisonhelpline.com/poison/chocolate
- ASPCA Animal Poison Control Center. People Foods to Avoid Feeding Your Pets. aspca.org/pet-care/animal-poison-control/people-foods-avoid-feeding-your-pets
- Merck Veterinary Manual. Serum biochemical analysis reference ranges. merckvetmanual.com/reference-values-and-conversion-tables/reference-guides/serum-biochemical-analysis-reference-ranges
- Ferrero. Nutella hazelnut spread: ingredients. nutella.com/us/en/products/nutella-hazelnut-spread
Laboratory methods and reference intervals vary. This article explains; it does not diagnose. For a decision about your pet, use the original report and talk to your veterinarian. Our editorial policy.