Toxic Foods for Dogs and Cats: What Not to Feed Your Pet

Feeding your pet a small piece of something off your plate can feel harmless. For some foods, it is. For others, it can cause serious illness or worse. The list of genuinely dangerous foods is shorter than many people think — but it is worth knowing by heart.

This guide covers the most important ones for dogs and cats, and explains what the actual risks are so you can make informed decisions rather than worrying unnecessarily about every morsel.

Foods Toxic to Both Dogs and Cats

Onions, Garlic, Leeks, and Chives

All members of the allium family damage red blood cells and can cause haemolytic anaemia. This applies to raw, cooked, dried, and powdered forms — powdered garlic and onion are more concentrated and therefore more dangerous per gram. Symptoms may not appear for several days: lethargy, weakness, pale gums, reduced appetite, dark urine.

Grapes and Raisins

The toxic compound is not yet identified, which makes this particularly serious — there is no safe dose. Even a small amount of grapes or raisins can cause acute kidney failure in dogs. Some dogs eat them repeatedly without apparent harm and then react badly one time; do not rely on past tolerance. Cats are generally less likely to eat them, but the risk is the same.

Xylitol (Birch Sugar)

Found in: sugar-free chewing gum, some peanut butters (check the label), diet yoghurts, sugar-free sweets, some vitamins and medications. In dogs, xylitol causes a rapid drop in blood sugar and can lead to liver failure. It is absorbed very quickly — symptoms can appear within 30 minutes.

Alcohol

Pets are far more sensitive to alcohol than humans. Fermented foods and drinks, bread dough (which produces alcohol as yeast ferments), and even alcohol-based hand sanitisers can all cause serious problems.

Caffeine

Coffee, tea, energy drinks, and some medications. Causes rapid heart rate, tremors, seizures.

Macadamia Nuts

Cause weakness, hyperthermia, vomiting, and tremors in dogs. Not confirmed to be dangerous for cats, but avoid both.

Foods Toxic Primarily to Dogs

Chocolate

Contains theobromine, which dogs metabolise very slowly. Dark chocolate and baking chocolate are the most dangerous; milk chocolate is lower risk but still harmful in larger amounts. Symptoms: vomiting, diarrhoea, restlessness, increased urination, muscle tremors, seizures.

Cooked Bones

Cooked bones — especially chicken, pork, and lamb — splinter easily and can puncture the stomach or intestines. Raw bones from a reputable source are a different matter and widely used in raw feeding, but this should be researched carefully before starting.

Avocado

The flesh, skin, and pit contain persin, which can cause vomiting and diarrhoea. Not as acutely toxic as the above but worth avoiding, especially in larger quantities.

Foods Toxic or High-Risk for Cats

Lilies

Worth a dedicated entry even though this is a plant, not a food. All parts of true lilies (Easter lily, tiger lily, Asiatic lily) are lethal to cats in very small amounts. Even drinking the water from a vase containing lilies can cause kidney failure. If your cat has chewed any part of a lily, this is a same-day emergency vet visit.

Tuna (in large amounts)

Tuna is not toxic, but a diet heavy in tinned tuna can cause mercury accumulation and thiamine deficiency over time. Tuna as an occasional treat is fine; as a regular meal it is not.

Raw Dough

The yeast in raw dough ferments in the warm stomach environment, producing alcohol and carbon dioxide. The dough also expands, causing distension.

Foods That Are Fine in Moderation

Many "dangerous foods for pets" lists include items like dairy, eggs, or certain vegetables that cause mild stomach upset at most. Plain cooked chicken, turkey, certain cooked vegetables, and plain rice are generally safe and used in bland diets during recovery. When in doubt, a quick call to your vet is the right move.

What to Do If Your Pet Eats Something Toxic

Act quickly. Do not wait for symptoms.

1. Remove the source if you can do so safely.
2. Check how much they ate and when.
3. Call your vet or an animal poison line immediately.
4. Do not induce vomiting unless specifically told to — some substances cause more damage on the way back up.

Having your pet's weight on hand (your health records or daily tracker will have this) helps the vet calculate the dose and risk immediately.