Last reviewed: August 2026
Small amounts of cooked or plain canned tuna (in water, not oil or brine) are generally fine occasionally, but regular feeding raises mercury exposure concerns.
Tuna itself isn't acutely toxic, but as a larger predatory fish it accumulates more mercury than smaller fish, and regular feeding over time could contribute to mercury exposure in a dog's diet. Occasional small amounts are a low-risk treat, not a reason for daily feeding.
General veterinary toxicology consensus, cross-referenced against the Merck Veterinary Manual and ASPCA Animal Poison Control Center food hazard references. See How We Source This for our methodology.
This page is general educational information, not a substitute for veterinary advice.