Can cats eat tuna?
In small amounts only. tuna isn't toxic to cats, but it isn't something to hand over freely either.
Why
Tuna is safe in small amounts, but too much can cause mercury poisoning and vitamin E deficiency. Canned tuna in oil is high in fat.
What to watch for
Mercury poisoning: lethargy, loss of appetite, tremors. Vitamin E deficiency: muscle weakness.
What to do
Offer canned tuna in water only, in small amounts and infrequently.
For cats specifically:
Tuna is safe for cats in small amounts, but too much can cause mercury poisoning and vitamin E deficiency. Canned tuna in water is safer than oil.
This page is not veterinary advice and is not a diagnosis. It's a general reference for a common food, and it can't account for your pet's size, age, health conditions, medications, or how much they actually ate. Toxicity is almost always about dose. If your pet has eaten something you're worried about — or is showing any symptoms — call your veterinarian, an emergency animal hospital, or a poison control hotline right away. Never induce vomiting unless a veterinary professional tells you to.