Every dog is different. Individual allergies and sensitivities are common — always introduce new foods in small amounts and watch for adverse reactions. This site is for informational purposes only and is not veterinary advice. Always consult your vet.
The Full Picture
Small amounts of plain, cooked tuna are safe for dogs. Tuna provides lean protein and omega-3 fatty acids. However, tuna has higher mercury levels than many other fish due to its size and lifespan. Regular or large servings can lead to mercury accumulation over time. Tinned tuna in water (not brine or oil) is safer than raw. Avoid tuna with added salt, spices, or garlic. As an occasional treat, tuna is fine, but it should not be a regular part of a dog's diet.
What You Should Know
While tuna is not outright toxic, there are important precautions to bear in mind before sharing it with your dog. Portion size matters, and certain preparations or varieties may be unsafe. If your dog has any existing health conditions, check with your vet first.