Foods Cats Cannot Eat - Complete List

Knowing what cats cannot eat is just as important as knowing what they can. Many common human foods are toxic to cats — some cause mild digestive upset, while others can be fatal even in small amounts. This complete list covers every food cats should never eat, with explanations of why each is dangerous.

Immediately Dangerous: Keep Away at All Times

Onions and Garlic (and All Alliums)

This includes onions, garlic, leeks, chives, shallots, and scallions — in all forms (raw, cooked, powdered, dehydrated). Alliums contain compounds (thiosulfates and disulfides) that destroy red blood cells in cats, causing hemolytic anemia. Symptoms include weakness, lethargy, pale gums, reduced appetite, and orange or red urine. Garlic is 5x more toxic than onions per gram. Even small amounts of garlic powder in food can be dangerous.

Grapes and Raisins

Grapes and raisins are highly toxic to cats and can cause acute kidney failure. The exact toxic compound is unknown, making any amount potentially dangerous. Symptoms include vomiting, diarrhea, lethargy, and reduced urination. Even a single grape can be fatal. This is a veterinary emergency.

Chocolate

Chocolate contains theobromine and caffeine, both of which cats cannot metabolize. Dark chocolate and baking chocolate are most dangerous; milk chocolate is less so but still toxic. Symptoms include vomiting, diarrhea, rapid breathing, muscle tremors, and seizures. Can be fatal.

Xylitol

This artificial sweetener is found in sugar-free gum, candy, baked goods, peanut butter, and some medications. Xylitol causes a rapid release of insulin in cats, leading to hypoglycemia (low blood sugar) and potentially liver failure. Symptoms include vomiting, lethargy, loss of coordination, and seizures. Extremely dangerous — check all labels carefully.

Alcohol

Even tiny amounts of alcohol can cause severe liver and brain damage in cats. Beer, wine, spirits, and foods cooked with alcohol are all dangerous. Symptoms include vomiting, disorientation, breathing difficulties, and coma.

Caffeine

Coffee, tea, energy drinks, and caffeine-containing medications are toxic to cats. Caffeine causes rapid heart rate, tremors, seizures, and can be fatal. Keep all caffeinated beverages away from cats.

Macadamia Nuts

Toxic to cats (and dogs). Cause weakness, hyperthermia, vomiting, and tremors. Mechanism unknown.

Raw Yeast Dough

Unbaked yeast dough expands in the stomach, causing painful bloating and potentially life-threatening gastric distension. The fermentation process also produces alcohol, adding a second toxic risk.

Toxic Plants and Natural Foods

Avocado

Contains persin, which can cause vomiting and diarrhea in cats. The pit is also a choking hazard and contains toxic compounds. Avoid entirely.

Tomatoes (Green/Unripe)

Green tomatoes and tomato plants contain solanine, which is toxic to cats. Ripe red tomato flesh is generally considered low-risk in tiny amounts, but it's safest to avoid entirely.

Dairy Products (For Most Cats)

Milk and Cream

Most adult cats are lactose intolerant. Cow's milk and cream cause digestive upset, diarrhea, and vomiting in lactose-intolerant cats. Despite the cultural image of cats drinking milk, it's not appropriate for most adult cats.

Ice Cream

High in sugar, fat, and dairy — all problematic for cats. Some flavors (chocolate, coffee, macadamia) are directly toxic. Never feed ice cream to cats.

High-Risk Foods

Raw Fish (as a Staple)

Raw fish contains thiaminase, an enzyme that destroys Vitamin B1 (thiamine). Thiamine deficiency causes neurological problems including seizures. Occasional raw fish is unlikely to cause harm, but it should never be a dietary staple.

Cooked Bones

Cooked bones splinter easily and can cause choking, internal punctures, and intestinal blockages. Never give cooked bones to cats.

Fat Trimmings

Large amounts of fat (cooked or raw) can cause pancreatitis in cats. Avoid giving fat trimmings from meat.

Liver (in Excess)

Small amounts of liver are nutritious, but too much causes Vitamin A toxicity (hypervitaminosis A), leading to bone deformities and joint pain. Limit to no more than 5-10% of the diet.

Tuna (in Excess)

Canned tuna for humans is high in sodium and mercury. Occasional small amounts are fine, but tuna should not be a dietary staple. Mercury accumulates over time and can cause neurological damage.

Dog Food (Long-Term)

Dog food lacks taurine, adequate Vitamin A, and sufficient protein for cats. Occasional accidental ingestion is harmless, but cats fed dog food exclusively will develop serious nutritional deficiencies.

Peanut Butter (with Xylitol)

Plain peanut butter without xylitol is not toxic, but many brands now contain xylitol. Always check the label. Even xylitol-free peanut butter is high in fat and calories and should be avoided.

Spinach

Safe for healthy cats in tiny amounts, but contains calcium oxalates that can worsen urinary crystals in cats prone to urinary disease. Avoid for cats with urinary or kidney issues.

What to Do If Your Cat Eats Something Toxic

1. Don't wait for symptoms to appear — contact your vet or an animal poison control hotline immediately
2. ASPCA Animal Poison Control Center: (888) 426-4435 (fee may apply)
3. Pet Poison Helpline: (855) 764-7661
4. Note what your cat ate, how much, and when
5. Do not induce vomiting unless specifically instructed by a vet

Keeping Your Cat Safe

The best way to protect your cat from toxic foods is to feed them a complete, balanced cat food and offer only verified-safe treats. Blue Buffalo Wilderness Crunchy Cat Treats Salmon Flavor are made with natural ingredients and specifically formulated for cats — a safe, tasty alternative to human food treats. Always keep toxic foods secured and out of reach, and educate all household members about what cats cannot eat.

Final Thoughts

The most dangerous foods for cats are onions, garlic, grapes, raisins, chocolate, xylitol, alcohol, and caffeine. Keep these away from your cat at all times. When in doubt about any food, consult your veterinarian before offering it — it's always better to be safe than sorry.