A little plain, cooked, or water-packed tuna is fine for most cats now and then. The problem is regularity: tuna lacks nutrients cats need, its strong taste can make cats refuse balanced food, and larger tuna species carry more mercury. Keep it rare and small.
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Caution — an occasional treat, never a dietAmount, form, or frequency matters
Can cats eat tuna? 🐟
A little plain, cooked, or water-packed tuna is fine for most cats now and then. The problem is regularity: tuna lacks nutrients cats need, its strong taste can make cats refuse balanced food, and larger tuna species carry more mercury. Keep it rare and small.
Source-linked record · Last reviewed July 17, 2026 · Not veterinary advice
Why this answer
Tuna on its own is nutritionally incomplete for an obligate carnivore — it is short on taurine, vitamin E, and other nutrients a complete cat food supplies. Fed often, it can crowd out balanced meals, and predatory fish like albacore accumulate more mercury than smaller fish, which adds up in a small animal fed the same can every day.
Watch for
Digestive upset if the tuna was oil-packed or seasoned
Fussy eating and refusal of regular food after frequent tuna
With long-term heavy feeding: poor coat and low energy from nutritional imbalance
How much is okay
About a teaspoon of plain tuna, once or twice a week at most, on top of a complete diet — not as a meal replacement.
Serve it safely
Choose water-packed or plainly cooked tuna; skip oil-packed, brined, or seasoned versions.
Offer a small flaked amount as a topper or treat, not a bowlful.
Skip raw tuna; cooking removes the parasite risk and breaks down thiaminase.
Sources and evidence notes (3)
Feeding Your Cat
Cornell Feline Health Center, Cornell University College of Veterinary Medicine — Feline nutrition fundamentals: cats are obligate carnivores; complete balanced cat food should be the diet base; treats should stay a small share of daily calories.
People Foods to Avoid Feeding Your Pets
ASPCA Animal Poison Control Center — Multi-species veterinary toxicology list covering alcohol, chocolate, caffeine, citrus, coconut, grapes and raisins, macadamia nuts, milk and dairy, nuts, onions, garlic and chives, raw meat and eggs, salty snacks, xylitol, and yeast dough.
Petfoodology
Cummings School of Veterinary Medicine at Tufts University — Board-certified veterinary nutritionist guidance on pet diets, treat limits (about 10% of daily calories), human-food snacks, and species-appropriate feeding for cats and dogs.
Answer card
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Type what your cat is eyeing — or already stole — and the answer lands right here, without leaving the page.
Remove access. Take the food away and move your cat to another room.
Note the facts. What was it, roughly how much is missing, and when? Keep the packaging.
Call before symptoms. For chocolate, onion, garlic, grapes, raisins, alcohol, or anything sugar-free (xylitol), call a hotline or your veterinarian now — early treatment is easier and cheaper.
Never do this
Do not induce vomiting, feed milk, salt, or oil, or wait overnight to "see how it goes". Signs of chocolate or Allium poisoning can take hours to days to appear.
Go to an emergency vet immediately if
Your cat is collapsing, twitching or seizing, struggling to breathe, drooling heavily, vomiting repeatedly, or wobbly on their feet.
Outside the US? Call your local emergency veterinary clinic — keep the number saved in your phone.
Effective: July 17, 2026
Can Cats Eat It? provides general educational information for cat owners. It is not veterinary, diagnostic, treatment, or emergency advice.
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