Toxic Foods Reference for Dogs and Cats

Many everyday foods that are perfectly safe for people are dangerous — sometimes lethal — for dogs and cats. The list below covers the foods most commonly involved in pet poisonings, with a short note on why each one is harmful. The goal is awareness, not dosing: any exposure to these foods is a reason to call your vet.

For dogs — dangerous foods

Common household foods that pose risks to dogs.

• Chocolate

  Contains theobromine, which dogs can't metabolize well. Darker chocolate (baking chocolate, dark chocolate) is significantly more dangerous than milk chocolate. Symptoms can include vomiting, restlessness, rapid heart rate, seizures.

• Grapes and raisins

  Can cause acute kidney failure in dogs. The exact toxic compound isn't fully understood, and sensitivity varies wildly between individual dogs — there is no known "safe" amount.

• Xylitol (also called birch sugar)

  A sugar substitute found in sugar-free gum, mints, baked goods, peanut butter, toothpaste, and some medications. Even tiny amounts can cause a sudden drop in blood sugar (hypoglycemia) and liver failure. Always check peanut butter labels before sharing.

• Onions, garlic, leeks, chives, shallots

  All members of the allium family destroy red blood cells in dogs, causing anemia. Damage is cumulative — small repeated exposures (like table scraps from dishes seasoned with onion or garlic powder) can add up to harm over time.

• Macadamia nuts

  Cause weakness, vomiting, tremors, and hyperthermia in dogs, usually within 12 hours. The mechanism isn't fully understood but the effect is well documented.

• Alcohol

  Dogs are far more sensitive to alcohol than humans. Even small amounts can cause vomiting, disorientation, and dangerous drops in blood sugar, body temperature, and blood pressure. Includes raw bread dough (which produces alcohol as it rises).

• Avocado

  Contains persin, primarily concentrated in the pit, skin, and leaves. The flesh is less toxic but can still cause stomach upset, and the pit is a serious choking and obstruction hazard.

• Cooked bones

  Not toxic, but dangerous: cooked bones (especially chicken, turkey, and pork) splinter easily and can puncture the digestive tract or cause obstructions. Raw bones carry their own risks (bacteria, dental fractures) and are not a safe alternative for everyone.

• Caffeine

  Coffee, tea, energy drinks, and caffeine pills affect dogs similarly to chocolate (caffeine and theobromine are related compounds). Symptoms include restlessness, rapid heart rate, tremors, and seizures.

• Raw yeast dough

  Two problems at once: the dough expands in the warm stomach (potentially causing obstruction or bloat), and the yeast produces alcohol as it ferments — leading to alcohol poisoning on top of the physical risk.

For cats — dangerous foods

All of the dog-toxic foods above also apply to cats. The items below are particularly relevant for cats.

• Lilies (Lilium and Hemerocallis species)

  Severely toxic to cats — even pollen brushed off on the fur and then groomed off can cause acute kidney failure. Includes Easter, tiger, day, Asiatic, and stargazer lilies. Keep these out of any home with cats. (Not on this page as a "food" exactly, but cats often nibble plants — and the kidney risk is too serious to leave off.)

• Raw fish

  Contains thiaminase, an enzyme that destroys vitamin B1 (thiamine). Long-term feeding can cause severe neurological problems. Cooked fish doesn't carry the same risk because heat deactivates the enzyme.

• Dairy (milk, cheese, cream)

  Most adult cats are lactose intolerant despite the cultural image of cats drinking milk. Dairy commonly causes diarrhea and stomach upset. Not life-threatening for most cats, but uncomfortable and worth avoiding.

• Raw eggs

  Two risks: salmonella exposure, and avidin (a protein in raw egg whites) which blocks the absorption of biotin and can lead to skin and coat problems over time.

• Dog food (long-term)

  An occasional bite is fine, but cats fed dog food long-term develop serious deficiencies — most notably in taurine, an amino acid cats can't synthesize on their own. Taurine deficiency causes blindness and a fatal type of heart disease.

Common misconceptions