Can Cats Eat Tuna?
Cats can eat tuna occasionally as a treat, but it shouldn't be a regular meal. Tuna is high in protein and omega-3s, which cats love. However, regular tuna consumption risks mercury accumulation, nutritional imbalances, and can make cats "addicted" to tuna, refusing other foods. Stick to small amounts of plain tuna packed in water.
Key Takeaways
- Cats are attracted to tuna's strong smell and taste—it's often irresistible to them.
- Raw tuna can contain parasites and bacteria—cooked or canned is safer.
- Cat foods with tuna are balanced for cat nutrition; plain tuna is not.
Explanation
Cats are attracted to tuna's strong smell and taste—it's often irresistible to them. A small amount as a treat or to encourage eating when appetite is low is fine. The protein and fish oils can be beneficial in moderation. For a safer everyday protein treat, cooked chicken is a better option for cats.
The risks of feeding too much tuna include: mercury buildup (tuna is high in mercury), thiamine deficiency (some tuna lacks vitamin B1 that cats need), and nutritional imbalance (tuna doesn't provide complete cat nutrition). "Tuna addiction" is also real—some cats refuse all other food, creating serious dietary problems. Cooked eggs offer a nutritious alternative treat with less risk.
If feeding tuna, use plain tuna in water (not oil), avoid flavored or salted varieties, and keep it to an occasional treat—not more than once or twice per week. Tuna-flavored cat food is formulated to be nutritionally complete and is safer as a regular option.
Cats are obligate carnivores with specific nutritional needs that differ significantly from dogs and humans. Many foods safe for other species can be harmful to cats.
Mercury levels in tuna vary significantly by species. Albacore (white) tuna contains about 0.35 parts per million of mercury on average, roughly three times more than skipjack (light) tuna at 0.12 ppm. For a 10-pound cat, even small regular doses of high-mercury tuna can accumulate over weeks because mercury binds to proteins and is slow to clear from the body. If offering tuna as a treat, light (skipjack) tuna in water is the safer choice.
You can freeze fish for longer storage if you want to keep a supply for cat treats. Tuna lacks several nutrients cats require for long-term health. It contains almost no taurine in canned form, and taurine deficiency can cause dilated cardiomyopathy (heart failure) and retinal degeneration leading to blindness within 6-24 months. Tuna also has an imbalanced calcium-to-phosphorus ratio of roughly 1:15, far from the ideal 1:1 ratio cats need for healthy bones. These deficiencies are why tuna-flavored cat food is formulated with added taurine and minerals.
Things to Know
- Raw tuna can contain parasites and bacteria—cooked or canned is safer. Learn more about whether raw salmon is safe to eat for similar fish safety concerns.
- Cat foods with tuna are balanced for cat nutrition; plain tuna is not.
- Kittens should avoid tuna until fully weaned and established on kitten food.
- Watch for signs of mercury poisoning: loss of coordination, muscle weakness.