Can Dogs Eat Tuna? Yes — But Only in Small Amounts

Tuna is a popular fish for humans, and many dogs are equally enthusiastic about it. In small amounts, tuna is safe for dogs — but its high mercury content means it's not a fish you should offer regularly or in large quantities. Here's what you need to know.

Is Tuna Safe for Dogs?

Yes — tuna is not toxic to dogs and provides protein, omega-3 fatty acids, and B vitamins. However, tuna is one of the higher-mercury fish available, and mercury accumulates in the body over time. Regular or large-quantity feeding of tuna can lead to mercury poisoning in dogs.

Mercury in Tuna: What You Need to Know

Mercury levels vary by tuna species:

• Skipjack tuna (light canned tuna): Lower mercury — safer choice for occasional feeding
• Albacore tuna (white canned tuna): Higher mercury — limit more strictly
• Bluefin tuna: Very high mercury — avoid

Signs of mercury poisoning in dogs include loss of coordination, tremors, vision problems, and kidney damage. These symptoms develop with chronic exposure, not a single serving.

How Much Tuna Can a Dog Eat?

• Small dogs: A teaspoon of canned light tuna occasionally (not more than once a week)
• Medium dogs: A tablespoon occasionally
• Large dogs: A few tablespoons occasionally

Tuna should be a rare treat, not a regular part of the diet.

What Type of Canned Tuna Is Safe?

• Choose tuna canned in water, not oil
• No added salt — check the label for sodium content
• Plain tuna only — no flavored varieties

Better Omega-3 Alternatives

For regular omega-3 supplementation without the mercury concern, Stewart Freeze-Dried Wild Salmon Treats are a lower-mercury option with 65% protein content. For daily supplementation, Pets Purest Salmon Oil delivers omega-3, 6, and 9 fatty acids with every meal — no mercury concerns.

Final Thoughts

A small amount of plain canned light tuna occasionally is safe for most dogs. But given the mercury content, tuna shouldn't be a regular treat. Salmon, sardines, and fish oil supplements are better choices for consistent omega-3 benefits without the mercury risk.