Cats love it — but tuna isn't a complete food
Most cats go wild for tuna, and a small amount as a treat or to hide a pill is fine. But tuna made for humans is not nutritionally complete for cats and shouldn't be a meal replacement.
Why to keep it occasional
- Not balanced — tuna lacks the full vitamins and minerals of complete cat food.
- Mercury — tuna can carry mercury that builds up with frequent feeding.
- "Tuna addiction" — some cats become so hooked they refuse their proper food.
- Too much oily fish can deplete vitamin E and cause a painful condition called steatitis.
How to serve it safely
Choose plain canned tuna in water (not oil or brine), no salt or seasoning. Offer just a teaspoon or two occasionally. Never give tuna mixed with onion or garlic (toxic to cats). Cat-formulated tuna treats/foods are a better routine option than human tuna.
Frequently asked questions
Can kittens eat tuna?
Best to avoid in kittens — they need complete, balanced kitten food for growth. A rare tiny taste is okay, but don't make it a habit.
Can cats eat raw tuna?
Not recommended — raw fish can carry bacteria and an enzyme (thiaminase) that destroys vitamin B1. Cooked or canned-in-water is safer.
More: full cat food checker · cat food calculator.