Tuna, especially larger species like albacore, can accumulate mercury; because cats are small, regular tuna consumption delivers far more mercury per pound of body weight than the same habit would in a person. Tuna's strong smell and taste are also highly palatable to cats, and some cats fed tuna regularly become so fixated on it that they refuse balanced cat food, risking nutritional imbalances such as insufficient taurine and vitamin E, and a phosphorus-to-calcium ratio that isn't ideal long-term.
VCA says regularly feeding tuna is dangerous because of its mercury content. VCA advises that treats, snacks and people foods together stay within 10% of a cat's daily calories, with the rest from a complete and balanced cat food. No source we checked gives an amount for this specific food, so ask your veterinarian about your own cat.
Two separate reasons: mercury can build up with regular feeding, and tuna is so palatable that some cats become 'addicted' to it and refuse other food, which can lead to nutrient gaps like insufficient taurine if tuna replaces a balanced diet.
Tuna-flavored cat foods that are formulated to be complete and balanced are designed for regular feeding, unlike tuna for people. Check the label to see whether a product is a complete food or a treat.
General public resources referenced while researching this tool's topic.
General educational guidance based on the references above, not veterinary advice. See our editorial policy for how we choose sources.
This tool is intended for educational purposes only and should not be used as a substitute for emergency veterinary advice, diagnosis, or treatment.
If your pet may have consumed toxic foods, chocolate, medications, chemicals, or other dangerous substances, seek immediate help from a licensed veterinarian or emergency animal service in your area. Do not delay professional care based on calculator or search results alone.
Pet poison hotlines (24/7, US and Canada):
ASPCA Animal Poison Control Center: (888) 426-4435
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Pet Poison Helpline: (855) 764-7661
Pet Poison Helpline states its service covers the U.S., Canada and the Caribbean. The ASPCA line is also used by Canadian pet owners. A consultation fee may apply to both. In Canada, your nearest 24-hour emergency vet clinic is the best first call; elsewhere, use local emergency veterinary directories.
How we calculate results: This tool uses commonly referenced veterinary toxicity thresholds and food safety guidelines. Actual toxicity can vary based on your pet's size, health status, and exact substance consumed. These results are estimates only and do not replace a veterinary assessment.