Can Cats Eat Tuna?

⚠️ In Moderation

✅ Cross-checked against veterinary poison-control guidance · Oct 2026 audit

⚠️ Educational info only. If your pet just ate something and looks unwell, skip the reading and call your vet or Pet Poison Helpline (US): (855) 764-7661.

Occasional small amounts only — tuna should be a treat, never a meal.

Why it’s a sometimes-food

Cats love tuna, but it is not nutritionally complete for them and accumulates mercury. A tuna-only diet causes vitamin E deficiency and other imbalances; even as a treat, frequency should be limited.

How to serve it safely

Use tuna in water, drained, no salt or oil, and offer no more than a tablespoon once or twice a week.

Warning signs to watch for

Long-term overfeeding can lead to mercury poisoning and "yellow fat disease" — look for reluctance to move, fever or dull coat over time.

When to call the vet

If tuna is a regular part of the diet, ask your vet to check for nutritional deficiencies.

Common questions

Why does my cat beg for tuna constantly?

Tuna is intensely aromatic and many cats are addicted to it. Keep portions tiny and rotate with regular cat food to avoid picky eating.

More foods for cats

Salmon✅ SafeYes, when fully cooked and unseasoned. Salmon is a nutritious fish most cats enjoy.Cow’s Milk🚫 Not RecommendedBetter to skip it. Most adult cats are lactose intolerant and milk gives them stomach upset.Garlic☠️ ToxicNo. Garlic is poisonous to cats — even more potent per gram than onion.Cooked Eggs✅ SafeYes, fully cooked and plain. Eggs are a protein-rich treat cats usually enjoy.Cheese⚠️ In ModerationSmall bites are usually fine, but many cats cannot digest dairy well.Cooked Chicken✅ SafeYes, plain and fully cooked. Chicken is one of the best meat treats you can give a cat.

This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away.