Can cats eat tuna? Yes, but only occasionally

Yes, a small amount of tuna may not harm a healthy cat, but human canned tuna should not be part of the regular menu. By itself, it lacks nutrients a cat needs and can contain excess sodium. Eating large amounts also raises concern about mercury exposure.

If your cat tasted a little

If they ate only a small amount and remain well, remove the rest and return to their usual complete food. Check exactly what was in the can or meal: oil, added salt, sauces, onion and garlic can change the risk. Call a veterinarian with the product details if it contained onion or garlic, your cat ate a substantial amount, seems unwell or has an existing condition.

Do not try home remedies or induce vomiting without professional instruction. Keep the label if you need to make a call.

Why tuna is not a complete meal

Cats Protection advises against regularly feeding canned tuna intended for people because it lacks essential nutrients. If it replaces balanced cat food, that imbalance becomes more important. Cornell also notes that human fish products are not a general alternative to food formulated for cats.

A complete commercial cat food that contains fish is a different product: its formulation should provide nutrients for the life stage stated on its label. Check that statement, rather than relying on the word “tuna” on the front.

If you want to offer fish

Ask your veterinarian if you want to use fish as a treat, particularly for a cat on a medical diet or with allergies. Cats Protection recommends properly cooked, boneless fish in small amounts as part of a balanced diet. A taste should not replace a complete meal or become a daily way to persuade your cat to eat.

If your cat accepts only tuna and refuses their usual food, ask for advice instead of waiting for hunger to solve it. Refusing food or a sudden strong preference can accompany a health problem. The priority is appropriate nutrition and the reason for the change. To check what a complete main diet should provide instead, read what cats can eat.

This guide provides general information. If your pet has symptoms, pain or a sudden change in behaviour, speak to a veterinarian. Read our editorial policy.