Can Cats Eat Tuna?

If you have ever opened a can of tuna and instantly found your cat appearing out of thin air, you’re not alone. The smell is irresistible to most felines, and it is easy to assume that if tuna is healthy for humans, it must be fine for them, too. But can cats eat tuna safely? The short answer is that they can, but only in moderation, (truly, it’s not as much as you might think). 

Let’s look at why that is, and what you can give your cat instead to keep them happy and healthy.

The Truth About Tuna

Tuna seems like such a harmless treat. Heck, it even seems like a healthy one thanks to being high in protein and rich in omega-3 fatty acids. Those nutrients are certainly valuable, but tuna can also cause problems when fed too often.

The issue comes down to toxins. Tuna are large, long-living fish that accumulate mercury and other pollutants in their bodies over time. When your cat eats tuna, even in small amounts, those toxins can slowly build up in their system, increasing the risk of mercury poisoning.

Why Too Much Mercury Can Be a Problem

Mercury is a heavy metal that can affect the brain, kidneys, and nervous system. Because cats are smaller than humans, it takes much less mercury to cause harm. If your cat eats tuna frequently, the buildup can eventually cause weakness, trembling, poor coordination, or changes in behavior. Some cats may seem more anxious or distant without their humans realizing the connection to diet.

So if you are wondering, can cats eat tuna every day, the answer is a resounding “NO”. Occasional bites are fine, but tuna should never be a daily habit.

Hidden Tuna in Cat Food

Even if you are not offering tuna straight from the can, it might already be hiding in your cat’s meals. Many wet foods and treats use tuna or “ocean fish” as a protein source. If tuna appears among the first few ingredients on the label, it is best to rotate it out and use other proteins to prevent overexposure.

Checking ingredient lists is an easy way to protect your pet. Look for cat foods made with safer fish such as salmon or sardines, or try chicken, turkey, or beef as the main protein instead.

Safer Alternatives to Tuna

If your cat loves the taste of fish, there are plenty of safer options that provide the same satisfaction without the risks. Here are a few great alternatives:

• Wild-caught salmon provides omega-3s and protein with lower mercury levels.
• Sardines are small fish packed with vitamins and minerals but carry fewer toxins.
• Anchovies are another safe, nutrient-rich option that many cats enjoy.
• Mussels or clams can be served occasionally as a special treat.
• High-quality fish oil supplements provide the benefits of omega-3s without the contaminants found in some fish.

Just keep in mind that fish or seafood should make up no more than 10% of your cat’s daily calories.

Feeding Fish Safely

If you plan to give your cat fish occasionally, always cook it plain and unseasoned. Avoid added oils, salt, or spices, as these can upset your pet’s stomach. Rotate protein sources often to keep your cat’s diet balanced and prevent nutrient deficiencies.

If you buy commercial cat food, choose trusted brands that use sustainable ingredients and test for contaminants. Your veterinarian can help you pick options that suit your cat’s needs and ensure their diet stays complete and balanced.

Hook, Line and Sinker

We’ve all been led to believe that tuna is perfectly safe for cats. But if you’ve wondered, “can cats eat tuna?” now you know the answer: yes, but only as a once-in-a-while treat. A small taste here and there is perfectly fine, but regular tuna meals can lead to mercury exposure and other health concerns. Choosing smaller fish or alternative proteins is a safer, healthier way to give your cat the variety they crave.

Peace of Mind – Equally Delicious

Caring for your cat means looking at the bigger picture. That includes not only feeding them wisely but also being prepared for unexpected health issues.

That is where pet insurance comes in. Whether your cat gets sick, develops an allergy, or eats something they shouldn’t, pet insurance can help you handle vet bills without stress. It allows you to focus on your pet’s care rather than the cost, so you can act quickly when they need help.

References:

1. Ahn JS, Kang KW, Kang WY, Lim HM, Cho S, Moon JD, Park WJ. Mercury poisoning in a fisherman working on a pelagic fishing vessel due to excessive tuna consumption. J Occup Health. 2018 Jan 25;60(1):89-93. doi: 10.1539/joh.16-0274-CS. Epub 2017 Nov 1. PMID: 29093364; PMCID: PMC5799106.
2. https://www.petmd.com/cat/nutrition/can-cats-eat-tuna
3. https://cats.com/can-cats-eat-tuna

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Disclaimer

The information contained on this blog is intended for informational and educational purposes only and should not be construed as medical advice. It is not a substitute for professional veterinary care. Always consult with your veterinarian before making any changes to your pet's health care or treatment plan.

The authors of this blog are not veterinarians and do not claim to be experts in pet health. The information provided here is based on our own experiences and research, as well as information from reputable sources. However, we cannot guarantee the accuracy or completeness of this information.

We encourage you to do your own research and consult with your veterinarian before making any decisions about your pet's health.