Dogs can have tuna, but only in small amounts, occasionally, and prepared very plainly (no oil, salt, onions, or sauces).

Quick Scoop

  • Yes, but rarely : Tuna is not toxic to dogs, yet it is high in mercury, so it should be a once-in-a-while treat, not a regular part of meals.
  • Best choice is plain canned tuna in water, with no added salt or seasonings, offered in tiny portions mixed into their normal food.
  • Too much tuna over time can increase the risk of mercury poisoning, which may show as lethargy, loss of coordination, or digestive upset.

How to feed tuna safely

  • Use:
    • Small forkfuls of plain tuna in water (no oil, no brine, no spices) as an occasional topper.
  • Avoid:
    • Tuna in oil, heavily salted tuna, tuna salads, sushi-style raw tuna, or any tuna mixed with onion/garlic.
  • Frequency guideline many vets and pet-nutrition sources suggest:
    • Tiny amounts, no more than once or twice a week, and much less for small dogs or puppies.

Benefits vs risks

  • Potential benefits:
    • Lean protein and omega‑3s that can support skin, coat, and heart health when used in moderation.
  • Main risks:
    • Higher mercury levels than many other fish, plus stomach upset if fed in rich, oily, or seasoned forms.

Better alternatives to tuna

  • Safer fish options often recommended instead of tuna include:
    • Cooked salmon, white fish like cod or haddock, or commercial dog foods that use controlled fish sources.
  • These species tend to have lower mercury levels and are easier to fit into a balanced, regular diet for dogs.

When to call the vet

  • Contact a vet if your dog eats a large amount of tuna (like a whole can) or shows signs such as vomiting, diarrhea, tremors, weakness, or unusual behavior afterward.
  • For dogs with kidney disease, heart issues, or allergies, always check with a vet before adding any new fish treat, including tuna.

Information gathered from public forums or data available on the internet and portrayed here.