Limited

Can dogs eat tuna?

A small bite of plain cooked tuna is usually okay for dogs, but tuna should stay occasional. Some tuna species accumulate mercury, and canned products can bring unnecessary sodium or oil.

Not medical advice — general pet-safety info only. Confirm with your vet before changing your dog’s diet.

Updated Jul 31, 2026 Category Nutrition

Alternatives to tuna for dogs

Purpose-made fish treats avoid tuna's everyday mercury and sodium concerns.

Salmon dog treats

Give fish fans a dog-focused seafood reward without making tuna a daily habit.

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Freeze-dried dog treats

Simple, portioned treats are easier to use than salty canned fish.

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High-value dog treats

Reserve a special dog treat for training instead of frequent tuna flakes.

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How much is okay?

Use a tiny amount of plain, boneless tuna only occasionally.

Small under 20 lb
1 teaspoon
Plain cooked flakes only.
Medium 20–50 lb
1 tablespoon
Rarely, not daily.
Large 50+ lb
Up to 2 tablespoons
Choose lower-mercury fish more often.

Rule of thumb: treats of all kinds should stay under ~10% of daily calories.

How to prepare them

  • Use plain cooked, boneless tuna with no oil or seasoning.
  • Avoid tuna salad, brine, flavored packets, and daily servings.

Risks & exceptions

  • Mercury exposure adds up with frequent tuna.
  • Canned tuna may contain salt, oil, onion, or garlic.

Tuna is an occasional taste, not a daily topper. Plain cooked, boneless fish is the only version to share.

If they ate too many

Rich or seasoned tuna is more likely than a tiny plain portion to upset a stomach.

  • Vomiting
  • Loose stool

Call your vet / pet poison line if:

  • Fish bones swallowed
  • Repeated vomiting or weakness

FAQ

Can dogs eat canned tuna?

Only a small amount of plain tuna packed in water, occasionally; avoid brine and flavored products.

Can dogs eat tuna every day?

No. Vary proteins and avoid routine mercury exposure.

Affiliate disclosure: we may earn a commission from product links. Safety guidance is editorial and may change — verify with your veterinarian for your dog.