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Can cats eat tuna?
Last updated 2026-05-08 · Sourced from ASPCA & Merck Veterinary Manual
Sometimes — with caution
Cats often crave it but mercury is a real concern.
The short answer
Sometimes — with caution — cats should only have small amounts of tuna. Small amounts only Common pelagic fish.
Remember: cats are obligate carnivores. They derive almost all their nutrition from animal protein, so even "safe" plant foods are treats — not staples.
Why be careful
Cats often crave it but mercury is a real concern.
What every cat owner should know
- Cat food formulated tuna is safer
- No daily tuna
What to do if your cat ate tuna
- Stay calm. Note how much was eaten and when.
- Call your vet or ASPCA Animal Poison Control at 888-426-4435.
- Or Pet Poison Helpline: 855-764-7661.
- Do not induce vomiting in cats unless instructed by a vet — it's risky.
- Bring product packaging to the vet visit.
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Kitten safety
Generally avoid feeding tuna to kittens. Their digestive systems are still developing and they're more sensitive to changes in diet, fat, sodium, and lactose than adults. If you've already given some, watch for vomiting, diarrhea, or lethargy and contact your vet if any appear.
What to do if your cat ate tuna
- Note how much was eaten and when. A small amount is rarely an emergency, but a large quantity may need vet attention.
- Watch for symptoms over the next 12–24 hours: vomiting, diarrhea, lethargy, loss of appetite, or changes in drinking/urination.
- Provide fresh water and skip the next meal if your pet seems unsettled — let their stomach calm down.
- Call your vet if symptoms appear or persist beyond 24 hours, or if the amount eaten was significant.
Better alternatives
If your cat likes tuna, they may also enjoy these safe options:
Frequently asked questions
Is tuna toxic to cats?
Not strictly toxic, but cats often crave it but mercury is a real concern.
How much tuna is too much?
Any amount carries some risk. If you choose to feed tuna, keep it to a tiny taste — not a regular treat.
Can kittens eat tuna?
Avoid giving tuna to kittens. Their digestive systems are still developing.
What should I do if my cat ate tuna?
Watch for symptoms over the next 24 hours and contact your vet if anything concerning develops.
Frequently asked questions
Can cats eat tuna?
Sometimes — with caution. Cats often crave it but mercury is a real concern.
What happens if a cat eats tuna?
Watch for vomiting, lethargy, hiding, or refusal to eat.
Is tuna toxic to cats?
Tuna carries some risk for cats. Cats often crave it but mercury is a real concern.