Foods that are toxic to cats and dogs

An evidence-based list of foods toxic to pets, from chocolate and xylitol to grapes and lilies, plus exactly what to do and which poison hotline to call.

2026-05-29

Articles · Daily Care

Most pet poisonings are everyday accidents: a dropped piece of chocolate, a sugar-free gum left in a bag, a guest sharing grapes. Food and drink consistently rank among the top reasons people call animal poison control. Knowing which common foods are genuinely dangerous, and exactly what to do if your pet eats one, is some of the most practical safety knowledge a pet owner can have.

This article gives a clear, sourced list of foods toxic to cats and dogs and a plain action plan for an exposure. If your pet may have eaten something toxic, do not wait for symptoms; the action steps near the end tell you whom to call right now.

What should I do first if my pet ate something toxic?

Act immediately: call your veterinarian, an emergency animal hospital, or a pet poison hotline right away, and do not try to make your pet vomit unless a professional tells you to. The two dedicated US hotlines are the ASPCA Animal Poison Control Center at (888) 426-4435 and the Pet Poison Helpline at (855) 764-7661, both staffed 24 hours a day. A consultation fee may apply.

Speed matters because many treatments work best, or only, before symptoms appear. When you call, have ready: what your pet ate, roughly how much, when, your pet’s weight, and the product packaging if there is one. Do not induce vomiting on your own; with some substances it causes more harm than good, and the safe decision depends on what was eaten. The scale of the problem is real: the ASPCA reports its Animal Poison Control Center responded to more than 451,000 calls and assisted over 322,000 animals in 2024, with food and drink among the top categories of exposure. Bring this same information to your vet if you go in person.

Which human foods are most dangerous to dogs and cats?

The most dangerous common foods include chocolate, xylitol (a sugar substitute), grapes and raisins, onions and garlic, macadamia nuts, alcohol, caffeine, and raw bread dough; for cats, lilies (though a plant, not a food) deserve special mention. Each can cause serious illness, and several can be fatal. Below, each is explained with the authority behind it.

The list that follows draws on the ASPCA Animal Poison Control Center, the Pet Poison Helpline, and the Merck Veterinary Manual. It is not exhaustive, when in doubt about any food, call a hotline, but it covers the items behind the majority of food-related calls.

Chocolate

Chocolate is toxic because it contains theobromine and caffeine (methylxanthines), which dogs metabolize slowly. Per the Merck Veterinary Manual, mild signs (vomiting, diarrhea, restlessness) can appear around 20 mg/kg of theobromine, cardiac effects around 40 to 50 mg/kg, and seizures at 60 mg/kg or more. The darker the chocolate, the more dangerous: baking and dark chocolate carry far more theobromine per ounce than milk chocolate. Dogs account for most cases; cats rarely eat enough but are still at risk. Signs may begin within 2 to 6 hours.

Xylitol (birch sugar)

Xylitol is an artificial sweetener in sugar-free gum, candy, baked goods, some peanut butters, and dental products, and it is highly dangerous to dogs. It may be labeled “birch sugar.” Per the Merck Veterinary Manual, dogs ingesting more than about 100 mg/kg can develop a rapid, dangerous drop in blood sugar (hypoglycemia) within 30 to 60 minutes, and doses above roughly 500 mg/kg can cause liver failure within 8 to 12 hours. Always check labels, including “sugar-free” products, before sharing anything with a dog.

Grapes, raisins, currants, and tamarind

Grapes and raisins (and currants and tamarinds) can cause acute kidney injury in dogs, and the toxic dose is unpredictable, small amounts have harmed some dogs while others tolerated more, so there is no known “safe” quantity. Research summarized in 2022 and reflected in the Merck Veterinary Manual points to tartaric acid as the likely toxic principle; dogs lack the transporter to excrete it efficiently, so it accumulates and damages the kidneys, often within 72 hours. Treat any ingestion as a reason to call a hotline.

Onions, garlic, chives, and leeks (Allium species)

Allium vegetables, raw, cooked, powdered, or in foods like soups and baby food, can damage red blood cells and cause anemia in both dogs and cats. Cats are especially sensitive. The danger is cumulative and can be delayed by days, so even seasoned table scraps or garlic-containing foods are not safe to share.

Macadamia nuts

Macadamia nuts are toxic to dogs and can cause weakness (especially in the hind legs), tremors, vomiting, and fever, typically within 12 hours. The mechanism is not fully understood, but the effect is well documented. Other nuts are mainly a choking or pancreatitis (high-fat) risk rather than specifically toxic.

Alcohol and raw yeast bread dough

Alcohol in any form, drinks, or foods, is dangerous; pets are far more sensitive than people and can develop dangerous drops in blood sugar, body temperature, and breathing. Raw bread dough is a double hazard: it expands in the warm stomach, and the yeast ferments to produce alcohol, causing both bloating and alcohol poisoning.

Caffeine

Caffeine in coffee, tea, energy drinks, and supplements acts much like chocolate’s methylxanthines and can cause agitation, a racing heart, tremors, and seizures. Coffee grounds and tea bags in the trash are a common source.

Lilies (a note for cat owners)

Lilies are not a food, but they belong in any cat safety list because true lilies (Lilium and Hemerocallis species, including Easter, Asiatic, tiger, and daylilies) are extremely toxic to cats and can cause fatal kidney failure. Per the ASPCA, even small exposures, a few bites of leaf or petal, pollen groomed off the fur, or water from the vase, can be deadly, and this is an emergency. Keep these plants out of any home with cats.

Are there foods that are toxic to cats specifically?

Beyond the shared dangers above, cats warrant special caution with onions and garlic (they are more sensitive than dogs), lilies (potentially fatal), and the general principle that “people food” treats can crowd out a balanced, often prescribed, diet. Cats are obligate carnivores with narrow nutritional needs, so even non-toxic table foods are rarely a good idea.

Because cats hide illness so well, an exposure can advance before you notice symptoms, which is another reason to call a hotline early rather than wait and watch. For cats already managing a chronic illness, a toxic exposure is an extra burden on systems that may have little reserve; owners of CKD cats in particular should be aware that several toxins, lilies, grapes (in dogs), Allium-induced effects, strike the kidneys and red blood cells specifically.

How do I prevent food poisoning at home?

Prevention comes down to physical barriers and household habits: keep toxic foods out of reach, secure trash, do not leave purses or bags with gum or medication accessible, and brief guests and children not to share food. Most poisonings are accidents of access, so removing access is the highest-impact step.

Practical habits:

What if I am not sure my pet ate enough to be harmful?

When you are unsure, call a hotline or your vet anyway; professionals can assess the risk from the amount and your pet’s weight, and many exposures turn out to be safe to monitor at home with guidance. The cost of a phone call is small next to the cost of guessing wrong with something like xylitol or grapes.

This is exactly where erring toward caution pays off, because several toxins have no reliably “safe” dose and act fast. If a poison professional advises watching at home, recording when the exposure happened and any symptoms that appear gives your vet a clear timeline if you do need to go in. Pawtient AI’s symptom log lets you note an exposure and track any signs over the following hours, useful information to relay to a hotline or clinic; you can see how it works on the features page.

Pawtient AI is an AI assistant and second opinion, never a diagnosis — always consult your veterinarian. In a suspected poisoning, your first call should be to your veterinarian, an emergency hospital, or a pet poison hotline; do not delay and do not induce vomiting unless a professional instructs you to.

Sources

By Pawtient AI Editorial Team. Educational content reviewed against published veterinary guidelines (IRIS, AAHA, WSAVA, ACVIM, AAFP). Not a substitute for veterinary care.

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AI assistant and second opinion, never diagnosis. Always consult your veterinarian.