Can cats eat tuna?

Important: This page is general informational content, not veterinary advice. If your pet ate something potentially toxic, is showing symptoms, or you are unsure, contact your veterinarian or a pet poison hotline immediately.

Important: As an Amazon Associate, Is This OK earns from qualifying purchases. Some links may be affiliate links. We do not claim to have personally tested every product listed unless explicitly stated.

Affiliate disclosure: As an Amazon Associate, Is This OK earns from qualifying purchases. These are broad pet food/supply search links to compare options; always follow veterinary guidance and species-specific care needs. We are not showing copied prices, ratings, reviews, or product images.

Compare cat food options Compare cat treats

Short Answer

Sometimes

Safety Summary

✔ Safe: Occasional small amounts
⚠ Use caution: Not for daily feeding
✖ Toxic: No — but mercury and malnutrition risks

Why

Cats love tuna and small amounts are safe occasionally. However, tuna should not be a dietary staple. Regular tuna feeding leads to mercury accumulation, can cause thiamine deficiency (especially canned tuna in oil), and creates addiction — cats that eat tuna constantly may refuse other food. Tuna packed in water is safer than in oil. Use as a treat or appetite stimulant, not a primary food source.

Portion Guidance

A small tablespoon a few times per week at most. Tuna in water is preferred.

Risks & Symptoms

Regular feeding: mercury poisoning, thiamine deficiency, malnutrition
Tuna addiction: refusal to eat balanced food
No acute toxicity in small amounts

FAQ

Is canned tuna for humans safe for cats?

In small amounts — tuna in water with no salt added is safest. Tuna in oil should be drained well.

My cat only wants tuna — how do I transition them?

Mix a decreasing amount of tuna with increasing amounts of regular cat food over 1–2 weeks.

Disclaimer

This is general information and not veterinary advice. Consult a vet for guidance specific to your cat.