Proteins
Can dogs and cats eat tuna?
Quick verdict for Tuna: see below the answer for dogs and for cats, the symptoms of poisoning (when applicable), and what to do if your pet ate it anyway.
In moderation
In moderation
Why is this the verdict?
A small, occasional piece of cooked or canned-in-water tuna (with no added salt, oil, or seasoning) usually doesn't cause problems. The key is not making tuna a habit: large fish like tuna accumulate mercury, and frequent consumption can lead to chronic heavy-metal poisoning over time, especially in cats, which are often given tuna more regularly.
Raw tuna also contains thiaminase, an enzyme that destroys vitamin B1 (thiamine) — frequent consumption of raw fish can cause a deficiency of this vitamin, with serious neurological symptoms over the long term. Tuna canned in oil or with sauce, and using tuna as an exclusive diet ('tuna addiction' in cats), are also not recommended.
Symptoms to watch for
Watch for these signs
- Short term, from a one-off excess: mild vomiting or diarrhea
- Long term (frequent use): signs of thiamine deficiency (loss of appetite, neurological problems) or mercury poisoning (lethargy, coordination problems)
What to do if your pet ate it anyway
An occasional piece doesn't require any action. If tuna has become a frequent part of the diet, cut back and talk to your veterinarian about replacing it with more nutritionally balanced proteins for everyday feeding.
Frequently asked questions
Can dogs eat tuna?
In moderation: tuna isn't toxic to dogs, but should only be offered in small amounts and occasionally.
Can cats eat tuna?
In moderation: tuna isn't toxic to cats, but should only be offered in small amounts and occasionally.
What should I do if my pet ate tuna?
An occasional piece doesn't require any action. If tuna has become a frequent part of the diet, cut back and talk to your veterinarian about replacing it with more nutritionally balanced proteins for everyday feeding.
Important notice
This content is educational and does not replace a veterinary evaluation. Every animal reacts differently depending on weight, age, breed, and health history — when in doubt, consult a veterinarian or an animal poison control center.