By Fabian Barcelo, Founder & Veterinary ScientistVet-reviewed
Open a tin of tuna and watch how fast the kitchen fills with a dog. Tuna is one of the most irresistible foods you can offer, and that is exactly why owners ask whether it is safe. At Innovet, our answer is a qualified yes. A little tuna now and then is generally fine for a healthy dog, but mercury, salt and the way the tin is packed all decide whether it is a good treat or a poor habit.
Key takeaways
- Cooked or tinned tuna is not toxic to dogs and can be offered as an occasional, small treat.
- Tuna can contain mercury, which builds up over time, so it should not be a daily food, particularly for small dogs.
- Choose tuna in spring water with no added salt or flavourings. Avoid brine, seasoned tins and anything with onion or garlic.
- Count tuna within the 10 per cent treat allowance, and ask your vet if your dog has kidney, heart or pancreatic issues.
01Is tuna safe for dogs?
Tuna is a lean source of animal protein, and nothing about plain cooked tuna is poisonous to dogs. The questions are about quantity and type. Like many large predatory fish, tuna can carry mercury, a metal that accumulates in the body over time. Occasional small portions are very unlikely to be a problem for a healthy dog. Regular, generous servings are another matter, particularly for small dogs, where a little tuna is a bigger share of body weight.
Salt is the second consideration. Some tinned tuna is packed in brine or with added seasoning, and salty foods are a poor fit for dogs with heart or kidney concerns. If your dog has any ongoing health condition, check with your vet before sharing human food.
02Which tuna is better, and which should you skip?
The packaging matters as much as the fish. A short, plain ingredient list tells you most of what you need to know.
Sensible choices
- Tuna in spring water with no added salt
- Well-drained, plain, boneless flakes
- A small portion, offered now and then
Better avoided
- Brine, heavy seasoning, sauces or flavoured tins
- Anything with onion, garlic or spices
- Raw fish from unknown sources
- Tuna as a daily staple or meal replacement
Raw fish carries its own risks, including parasites and bacteria, and sushi-style preparations often include seasoning and rice that do not suit dogs. Tinned oil-packed tuna is high in fat and calories, which matters for dogs prone to pancreatitis or weight gain. Our guide to ingredients to avoid in dog treats is a useful companion when reading any label.
03How much tuna is too much?
There is no single safe number, because it depends on your dog's size, health and the rest of their diet. What we can say is that tuna should sit inside the treat allowance, not on top of it. A common guide is that treats and extras should make up no more than about 10 per cent of a dog's daily energy.
The treat rule
Tuna is a treat, so it counts
Everything that is not a complete and balanced meal, including tuna, shares one small allowance. Our guide to how many treats per day shows how to work out your dog's share. For small dogs, a teaspoon of flakes can be a meaningful amount.
If you would like tuna to be a regular feature, rotate it with other proteins rather than feeding it daily, and talk to your vet about what suits your dog.
The best tuna treat is a small one, plain, and not every day.Innovet
04Why dogs love tuna, and what it offers
Tuna is strongly scented and high in protein, which is why dogs find it so appealing and why it works for fussy eaters. Protein supports muscle maintenance, and our overview of protein for dogs and cats explains how much dogs need and where it comes from. It also explains the pull of high-protein treats as a category.
Appeal is also useful when appetite dips. If your dog is off their food, our article on when your dog will not eat sets out gentle options, and a vet visit is the right step if it continues.
05What to look for in a tuna treat
Many owners prefer a purpose-made tuna treat to sharing the tin, because the portion is controlled and the ingredients are known. Whatever you choose, a few criteria separate a good treat from a filler.
Real fish first
Tuna should lead the ingredient list, not a long list of fillers.
Clean label
No artificial colours or flavours, and no added sugar or salt.
Transparent portions
A clear serve size so treats fit inside the 10 per cent rule.
Purpose
A treat that adds something, such as protein or joint support.
At Innovet, we made BoostBites+ for exactly this. It is real tuna cubes coated with our Health Boost+ ingredients, including human-grade whey protein, glucosamine HCl, vitamins and minerals, as a functional daily treat or topper for muscle maintenance, recovery and everyday wellness. It suits fussy eaters, senior pets and low-appetite periods. For the wider range, see our guide to healthy pet treats in Australia, and for the bigger picture on pet supplements, the dog supplements guide.
It is nutritional support, not a replacement for a complete diet or for your vet. If your dog has a medical condition or is on a prescription diet, ask your vet before adding any treat. Cat owners can read our guide to high-protein nutrition for cats.
Frequently asked questions
Can dogs eat tinned tuna?
Yes, in small amounts. Choose tuna in spring water with no added salt or flavourings, drain it well and offer it only now and then. It is not a daily food, mainly because of mercury and salt.
Is tuna bad for dogs because of mercury?
Tuna can contain mercury, which accumulates over time. An occasional small portion is unlikely to harm a healthy dog, but regular or large servings are best avoided, particularly for small dogs. Rotate proteins and ask your vet.
Can dogs eat raw tuna?
It is best not to. Raw fish can carry parasites and bacteria, and sushi-style tuna often includes seasoning and rice. Cooked or tinned plain tuna is the safer option when you want to share some.
Is tuna in oil or brine okay for dogs?
Spring water is the better choice. Brine adds salt, and oil adds fat and calories that can upset the stomach or contribute to weight gain and pancreatitis risk. Avoid seasoned or flavoured tins altogether.
How much tuna can I give my dog?
Keep it small and occasional, and count it within the treat allowance of about 10 per cent of daily calories. The right amount depends on your dog's size and health, so ask your vet if you are unsure.
Can puppies eat tuna?
It is best to check with your vet first. Puppies are small, growing quickly and more sensitive to dietary changes, so a complete puppy diet should come first and extras should stay minimal.
What is a good tuna treat for dogs?
Look for real tuna as the first ingredient, a clean label with no added sugar or salt, and clear portion guidance. BoostBites+ is a tuna cube treat with a Health Boost+ coating that adds whey protein, glucosamine, vitamins and minerals.
A protein-rich tuna treat, done properly
Real tuna cubes with a Health Boost+ coating for everyday wellness, recovery and fussy eaters.
Shop BoostBites+ →Human-grade · Australian-made
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