Can Cats Eat Tomato Sauce?

No, cats should not eat tomato sauce. Ripe tomato alone is not poisonous, but sauce is often made with onion or garlic. The Merck Veterinary Manual calls cats the animals most sensitive to these foods, which can damage their red blood cells. A tiny lick of plain sauce is a lower risk, but it is best to keep sauce away.

Why is tomato sauce bad for cats?

The tomato is not the main problem. The ASPCA says ripe tomato fruit is not toxic to cats. The trouble is what goes into the sauce.

Onion and garlic belong to a plant family called Allium, along with chives and leeks. The ASPCA says they can upset the stomach and damage red blood cells, which can lead to anemia. Anemia means the body does not have enough healthy red blood cells to carry oxygen. Pet Poison Helpline also lists garlic and onion as poisonous to cats.

The Merck Veterinary Manual adds a few important points:

• Cats are the most sensitive animals, even more than dogs.
• Raw, cooked, and dried forms can all cause harm.
• Cooking does not make onion safe. Cats have gotten sick after less than a teaspoon of cooked onion.
• Garlic is about 3 to 5 times more toxic than onion.
• Onion and garlic powders and dried soup mixes are the forms most often linked to poisoning in cats and dogs.

Many sauces use onion or garlic, fresh or as powder. Read the label, and keep in mind that homemade sauce often has them too.

What about the tomato plant?

The leaves and stems are a separate risk. The ASPCA lists the tomato plant as toxic to cats because of a substance called solanine. If your cat chews the plant, you may see drooling, loss of appetite, bad stomach upset, weakness, wide pupils, and a slow heart rate. Our guide on whether cats can eat tomatoes covers this in more detail.

What about salt?

Sauce can also be salty. The ASPCA says too much salt can make pets very thirsty and make them pee more. In larger amounts it can cause vomiting, diarrhea, tremors, and seizures. The ASPCA page does not say how much salt is in any sauce, so check the label if you are worried.

What signs should I watch for?

The Merck Veterinary Manual says signs usually appear only after many red blood cells have been damaged, often a few days after the cat ate the food. Watch for:

• Tiredness or weakness
• Not wanting to eat
• Fast breathing or a fast heartbeat
• Pale gums
• Yellow-tinged skin or gums
• Dark urine
• Collapse

Any of these means a vet visit right away.

What should I do if my cat ate tomato sauce?

1. Check the label or recipe for onion, garlic, onion powder, or garlic powder.
2. Call your vet or a poison hotline. Tell them how much your cat ate, and bring the jar or recipe.
3. Follow their advice. The Merck Veterinary Manual says vets try to remove recent food early, then may give fluids and oxygen. Severe cases may need a blood transfusion. Vets use cat-safe medicine for this, so don’t try it at home.

Getting help early gives your vet the most options.

What can I give my cat instead?

A complete cat food already gives your cat what it needs, so sauce is never required. If you want to share a treat, ask your vet what suits your cat. See our list of foods that are toxic to cats, and read about onions and garlic for more detail.