Can dogs eat tuna?
The full picture
Tuna is safe for dogs in small amounts but isn't ideal as a regular food. As a large predatory fish, it accumulates mercury in its flesh, and frequent tuna consumption can lead to mercury poisoning over time — especially in smaller dogs. Tinned tuna is safest if it's in spring water, not brine (too much salt) or oil (unnecessary fat). Fresh tuna should be cooked plain. It's a useful 'emergency protein' if you've run out of dog food, but don't make it a habit. Salmon or sardines are better regular choices.
If your dog ate more than a safe amount
Risks to watch for
- Mercury accumulation over time
- Excess salt from brine varieties
- Excess fat from oil-packed varieties
Potential benefits
- High-quality protein
- Omega-3 fatty acids
- Most dogs love it
Safe portion size
A tablespoon once or twice a month for a medium dog.
Safer alternatives
- salmon
- plain tinned sardines in spring water
How we keep this site free. Some links on this page take you to Amazon. We earn a small commission if you buy something — at no extra cost to you. We only recommend categories we'd genuinely use ourselves, and the editorial above is written first, products picked second. Full disclosure.