Can Dogs Eat Canned Tuna?
Why it’s a sometimes-food
Unlike lean white fish used in regular meals, tuna accumulates mercury over time, so frequency matters more than portion size. Choose tuna packed in water — oil-packed versions add unnecessary fat, and brine adds sodium dogs do not need.
How to serve it safely
Use tuna in water, drained, with no salt added, and offer a tablespoon or less once or twice a week at most. Skip flavored or spicy varieties.
Warning signs to watch for
Long-term frequent feeding can lead to mercury buildup; overdoing oil-packed tuna causes vomiting and loose stools.
When to call the vet
If tuna becomes a regular food, ask your vet how often is safe for your dog’s size.
Common questions
Can dogs eat tuna in oil?
Drain it thoroughly or skip it — the oil adds a heavy fat load. Water-packed is the right choice.
How often can a dog have canned tuna?
Once or twice a week in small amounts keeps the mercury question irrelevant for most dogs.
More foods for dogs
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away.