Is canned tuna good for dogs

By Isabella Storyclaire

last updated November 19, 2024

Contributions sourced from

Can Dogs Eat Tuna?

It may pose risk of mercury poisoning

Compared to other fish, tuna contains relatively high levels of mercury, and this raises the risk of mercury toxicity if animals eat too much tuna. Mercury is an industrial pollutant that leaks into the oceans, where it is taken up by fish. Because tuna fish live a long time sometimes up to 40 years they can accumulate a relatively large amount of mercury in their tissues over time.

Signs of mercury poisoning to be aware of are:

Make sure you contact your vet if you notice any unusual signs that may suggest your dog is experiencing an adverse reaction.

However, when fed occasionally and in very small portions, tuna has a low chance of causing mercury poisoning. Its always a good idea to check with your vet before introducing this fish into your dogs diet. They will be able to recommend the right portion size, based on your dogs weight and health history.

Bones can be a choking hazard

Fish bones are notorious for posing a choking risk for dogs, and tuna fish is no different. When ingested, these small bones can also scratch the delicate digestive tract or even get stuck on their way through. So, if you decide to offer tuna to your dog, its a good idea to check for any pieces of bone that may pose a risk and remove them before feeding.

It has a high salt concentration

Some experts give a negative answer to the question can dogs eat tuna based on its high salt content. After all, this is a fish that lives in salt waters. The good news is that moderation is key to minimising this risk as well. As long as you only feed a small amount, your dog should be able to enjoy tuna every once in a while.

Can Dogs Eat Tuna?

NOTE: Always check with your veterinarian first before giving your dog any new foods, especially people foods. What might be OK for one dog might not be good for your dog, depending on multiple factors, such as their age, health history, health conditions, and diet. Dogs on prescription diets should not be fed any food or treats outside the diet.

Whether youre a fan of seafood or not, chances are your dog is probably a fan of most snacks from the sea. Their noses seem to go into hyperdrive anytime theres something fishy on the menu including tuna. Whether its served canned, seared, or sushi-style, tuna is a popular protein and if your dog is around, you might even catch them begging for a bite.

But just because she wants a nibble of your tuna salad sandwich doesnt mean you should let your dog share the fish. While dogs can have tuna in small amounts as a rare treat, it shouldnt be their main course at dinner.

When it comes to tuna and dogs, there are a few risks you should consider before feeding your pooch this popular fish. So while a dog can have tuna, its probably not the best option for them.

Is Tuna Good for Dogs?

Tuna is packed with protein and omega-3 fatty acids, which are important nutrients for maintaining your dogs skin, coat, and joints. This fish also contains several essential vitamins and minerals, including vitamin B12, selenium, and niacinall good things for a dogs diet. When fed in very small amounts as an occasional treat, tuna is OK for dogs to eat.

But while tuna can be safe for dogs in small amounts on special occasions, it should not be their main source of nutrition or a regular ingredient in their bowl. Tuna contains relatively high levels of mercury, a heavy metal that can cause poisoning in humans and animals alike. Because tuna is a big fish thats higher on the food chain, says the U.S. Food and Drug Administration (FDA), tuna has higher levels of mercury than nearly all other commercial seafood products. There are several other kinds of seafood, including salmon, that are considered safer options to feed your dog if youre looking for a nutritional addition to their diet.

Do not feed tuna to puppies, even if its just a tiny bit on rare occasions. Mercury poisoning can pose a serious risk for dogs, especially small breeds and pups who are still developing.

Signs of Mercury Poisoning in Dogs

Because of the high levels of mercury, pet parents who do feed their dog tuna should understand the risks of mercury poisoning for dogs who eat too much of the fish.

Call your vet if your pet exhibits any of these symptoms of mercury poisoning:

In severe cases, mercury poisoning can lead to kidney damage and even blindness, so its important to limit the amount and frequency of tuna your dog is allowed to eat. In fact, its really best to avoid feeding tuna to your dog altogether.

My Dog Ate Tuna. Now What?

A small amount of tuna is not considered dangerous for your dog and is fine as an infrequent treat. But too much tuna can pose a risk to dogs who eat large amounts of the fish or snack on it too often. If Fido happens to steal an entire can of tuna, he might experience an upset stomach, especially if the tuna was packed in oil instead of water. In fact, tuna packed in oil can lead to pancreatitis in dogs.

Keep a close eye on your pet if they eat a large amount of tuna, especially the kinds that are known to have higher levels of mercury (like albacore tuna). If you do notice any of the symptoms of mercury poisoning, head to the vet right away for immediate treatment.

How Vets Treat Mercury Poisoning in Dogs

If you suspect that your dog has mercury poisoning after consuming a large amount of tuna, call your vet ASAP. Early treatment can be critical in helping to reduce the risk of long-term health effects and increase the chances of a full recovery.

Treatment for mercury poisoning in dogs depends on the severity of the poisoning and their symptoms. In some cases, treatment may include IV fluids and medications to control vomiting and diarrhea.

If the poisoning is severe, your dog may need to be hospitalized so they can be treated with medications designed to bind to mercury and remove it from the body (like charcoal). Some dogs may even need dialysis to remove the toxin from their kidneys.

Can Dogs Die From Eating Tuna?

While highly unlikely, it is possible for dogs to die from eating tuna, especially if they consume very large amounts of tuna contaminated with high levels of mercury. Mercury poisoning can be a serious and potentially life-threatening condition and, if left untreated, can lead to kidney failure and death.

However, its important to keep in mind that not all tuna contains high levels of mercury, and the risks may vary depending on the type and amount of tuna consumed. Its generally safe to feed your dog small amounts of cooked tuna as an occasional treat, but it should not be a regular part of their diet. Never give tuna to dogs that are small, young, or have any health problems.

What Other Fish Can Dogs Eat?

Fish can be a nutritious and tasty addition to a dogs diet in small amounts. Some of the fish that are considered safe for dogs to eat include:

Salmon: A good source of protein, omega-3 fatty acids, and other nutrients that can support healthy skin and a shiny coat in dogs
Whitefish: A low-fat, low-calorie protein source that is a good choice for dogs with food sensitivities

Oysters: A good source of protein, zinc, and other nutrients, but high in cholesterol and should be fed in moderation
Fish oil: This supplement can help your dog get enough omega-3 fatty acids without splurging on a full filet. Fish oil is recommended by vets for the treatment of many inflammatory diseases in dogs, including skin conditions, arthritis, digestive issues, diabetes, kidney and heart disease, epilepsy, and even some types of cancer.

Reminder: All seafood should be cooked before adding to your dogs bowl to ensure that its safe for them to consume. Raw seafood can contain harmful bacteria and/or parasites that can cause illness in dogs. So, sorry Fido, that means no sushi for you.

Featured Image: iStock/Chalabala

Can Dogs Eat Tuna? One-Stop Guide to Feeding Your Dog Tuna

As responsible and loving dog owners, its just normal for us to be so giving to our dogs desires. But sometimes, we just have to stop and ask whether what we are about to do can do more harm than good. This is especially true when it comes to their diet. For example, can dogs eat tuna?

And if they can, are there some considerations or limitations that we have to know to keep our pooch safe and healthy? Are there also certain types of tuna fish that cant be eaten at all? Can we feed our dogs tuna every day or use tuna as our dogs primary protein source?

We got it. There are a lot of questions surrounding tuna fish and dogs, and in this article, we will try our best to answer all of these.

And in case you still have concerns after reading this post, feel free to leave a comment or get in touch with us. We are more than willing to help.

What Is Tuna?

Tuna is a nomadic saltwater fish that can be found throughout the oceans of the world from the Atlantic Ocean to Indonesia. Tuna fish belong to a subgroup of the mackerel family, and it is one of the most popular and widespread fish worldwide.

Tuna can live a long life, and being carnivores, they are on top of the food chain in the ocean. It is believed that tuna can reach until the ripe age of 50, can grow anywhere between 1 to 15 feet in length, and could weigh as much as 1500 pounds.

There are over 20 types of tuna, but only five are edible and safe for consumption. And these are yellowfin, skipjack, albacore, bigeye, and bluefin.

Skipjack tuna, also known as light tuna is the most commonly known species in the United States. Albacore tuna is the only species that can be legally sold under the name white meat tuna.

Tunas are not just tasty, they are also loaded with vitamins, minerals, and other essential nutrients. No doubt, humans love eating them so much, and some companies manufacture commercial dog foods with tuna because of their nutritional value, and high protein content.

Can Dogs Eat Tuna? Is It Good?

Tuna is not toxic for your canine companion, so dogs can eat tuna. However, while tuna is rich in nutrients that can be helpful for your dogs growth, development, and overall health, you shouldnt feed your dog tuna fish regularly.

This can be intriguing considering that tuna is a highly nutritious fish, but once you see the other side of this fish you will realize why feeding dogs tuna every meal is not recommended.

First and foremost, tuna may contain high mercury levels than other fish because of their age and size. This may put your dog at risk for mercury poisoning, which can cause irreversible damages to a dogs organs and can even be a fatal condition.

And second, tuna is also high in sodium, which can also be problematic for dogs when consumed in large amounts over a while.

There are still other risks involved in feeding your dog huge amounts of tuna regularly, and we will talk more about them in one of the subtopics below.

If you want to add a novel protein (alternative source of protein) to your dogs diet, you can give tuna as a dog treat, but not as a daily staple.

Smaller and younger, wild-caught fish are safer for your pup and these include whitefish, flounder, salmon, herring, catfish, cod, whiting, and light tuna fish (canned).

Health Benefits of Tuna for Dogs

Tuna can offer your pooch a multitude of health benefits, so theres no doubt that it can be a great addition to your dogs diet.

Tuna is high in lean proteins and low in bad fats that can cause obesity and several weight-related health problems. Hence, tuna can be an amazing alternative to beef and other red meats for your dogs protein source.

Tuna is also rich in essential vitamins and minerals that can help your canine companions to thrive. It is particularly packed with vitamins B3, B6, and B12, which are all beneficial in strengthening your pups immune system, and in promoting healthy metabolism, and high energy levels.

Tuna is also high in selenium, which is helpful for a dogs immune system and joint health. It is also rich in potassium and magnesium, which are both great in promoting healthy bones and muscles, as well as phosphorus, which is vital for your dogs bone strength.

Moreover, tuna is also packed with antioxidants, which are essential in fighting the harmful effects of free radicals, which include the prevention of cancer.

Of course, we cant conclude the benefits of tuna without emphasizing its high Omega-3 fatty acids content. Aside from being a rich source of protein, tuna is popularly known for this, which is really noteworthy.

Omega 3 fatty acids are vital not just in maintaining your dogs healthy and shiny coat, but more so in promoting cardiovascular health, reducing inflammation, and lowering cholesterol levels.

And like what was mentioned earlier, tuna is a great novel protein for dogs. Meats that are not commonly found in dog foods are called novel proteins, and tunas are novel proteins since dogs dont eat them that often.

The role of novel proteins can be more appreciated when a dog develops allergy or sensitivity over time to his primary source of protein.

Hence, substituting tuna with beef or chicken once in a while can help prevent allergies due to long-term and frequent intake of the same type of meats. Aside from tuna, venison and duck are also used as novel proteins.

Health Complications of Tuna for Dogs

If theres one amazing addition to your dogs diet, it can be tuna fish as long as its only given in moderation.

Instead of giving your pup tuna every day, you can treat them as dog treats or occasional toppings to their favorite dog food. You can even use tuna juice to add flavor and make the meal more palatable for your pooch.

Adding too much tuna to your dogs diet can cause several health problems. To start, tuna contains high levels of mercury compared with other types of fish such as tilapia, flounder, or salmon. Skipjack and albacore contain the lowest concentration of mercury in the tuna family.

Why does tuna contain a higher level of mercury compared with other types of fish that are caught and sold in the market?

Well, industrial pollutants leak mercury, which then flows into lakes, rivers, and oceans. Once this heavy metal is in the water, it will be consumed by the fishes and other forms of life that live there.

And as we mentioned earlier, the larger the fish and the longer it has been living in the body of water, the higher the concentration of mercury will be in its tissues.

Compared with other edible fishes, tuna can grow bigger and they can also live longer thereby allowing more mercury to accumulate in their system.

So, if you are going to feed your dog fish that contains high levels of mercury for an extended time, then, your dog may be at risk for mercury poisoning. If the symptoms are not caught in time and there are no medical interventions, this condition can kill your dog.

Below are the symptoms of mercury poisoning that you should watch our:

Hair loss
Vision problems
Vomiting, often with blood
Diarrhea, often with blood
Anxiety or nervousness
Loss of sensation in their paws
Tremors
Kidney problems (inability to urinate, shaking, whimpering, abdominal swelling)

Contact your local veterinarian immediately if you notice any of these symptoms.

Moving on, tuna lives in salty water, so their meat can absorb the salt (sodium chloride) from their habitat. This also means that the tuna that are available for us and our canine companions to consume may have high sodium levels in their meat.

Too much intake of sodium can be a problem in dogs since salt is poisonous for them when taken in huge amounts. Hence, its best to offer your dog tuna in moderation.

One of the common health problems in dogs associated with high sodium intake is sodium poisoning. Symptoms of this condition that you should watch out for include:

Nausea and vomiting
Convulsion
Lethargy
Loss of appetite
Swelling of tongue
Excessive urination
Extreme thirst

Another reason for dog owners to be concerned about feeding dogs tuna is the enzyme thiaminase. This enzyme can be found in raw tuna and other raw fish for that matter.

When it goes into your dogs system, it can break down vitamin B1 (thiamine) in your dogs diet. This wouldnt be a concern, though, if you make sure to only give your dog cooked tuna.

Moreover, the high protein concentration in dogs can also be problematic to some extent. When your dog eats a lot of tuna and ends up consuming too much protein, his digestive system may not be able to tolerate it. This can leave them with an upset stomach, which can be uncomfortable for your pup.

How to Add Tuna to Your Dogs Diet

When feeding your dog tuna, its best to clean it first thoroughly, remove the bones, and cook it properly. You may bake or broil the tuna fish, and make sure not to add salt or other seasonings. Dogs love the bland taste of meats, so they would be happy to munch on your homemade tuna dish in a heartbeat.

Its also not advisable to serve raw tuna to your pooch as this can increase their chances of being exposed to harmful bacteria and parasites. And if you choose to buy canned tuna for your dogs, stick to canned tuna products that are packed in water rather than oil.

Oil is high in calories. And though it is not toxic for dogs, its just empty calories that can only cause obesity and it doesnt add nutritional value to their diet.

Aside from obesity, excessive oil intake can also lead to an inflamed pancreas, which can have serious health implications for your dog. So, its better to stick with fresh tuna or with canned tuna that is soaked in water.

You may also offer your dog a portion of your tuna sandwich with mayonnaise, but not every day, of course. Your dog may love the taste and smell of mayo, so its all up to you to control how much he consumes. Remember that mayo is fattening, so, its important to only add it to your pups diet in small amounts.

Moreover, when giving your dog a bite from your tuna sandwich, make sure to stay away from any red flag ingredients for dogs. For instance, onion and garlic are toxic for dogs, and too much salt is also harmful to them.

So, always watch out for the food that you prepare for yourself that you end up offering to your pooch. Sometimes even if our intentions are good, our actions can still have bad effects on our dogs if we are not extra careful.

Final Thoughts

Without a doubt, tuna is a highly nutritious fish that can be good for dogs. However, like what was mentioned above, they can also cause some health problems when taken in huge quantities regularly.

Hence, if you want to add tuna into your pups diet, you may do so by giving it as a treat and not as a part of their daily meals.

If you are feeding your dog freshly cooked tuna, you may give them one or two small bite-size pieces every week or every other week.

And since the weight of your dog may also influence how much tuna they can safely take, these portions may vary if you have a small or a larger dog. You may adjust the frequency or the number of pieces accordingly.

To be more specific, it is safe to feed dogs weighing around 20 pounds one full can of tuna about once every three weeks.

A dog weighing 40 pounds can have one standard size of canned tuna every nine days, and a 90-pound dog can safely wolf down on a can of tuna about once every five days.

These portions are safe for healthy adult dogs. You shouldnt feed your puppies tuna at all, and if you have senior dogs, you may also want to limit if not totally stay away from tuna.

Adult or senior dogs with sensitive stomachs or that are experiencing digestive issues shouldnt be fed tuna at all.

How much tuna can I give my dog?

Tuna is safe when fed in moderation, but do not feed your dog tuna regularly as it will contribute to the accumulation of mercury in your pooch's tissues. Keep any tuna your dog eats to a small amount, as little as one tablespoon, and do not feed them tuna every day.

Can Tuna kill a dog?

Small amounts of cooked or canned tuna don't contain enough mercury to cause a problem in your dog if given periodically. Adult dogs should not eat cooked or canned tuna more than once or twice a week, in small amounts.

Which canned tuna is best for dogs?

So when feeding tuna fish for dogs, always choose skipjack or albacore tuna for a lower mercury content per serving. Research shows that each fish has the following mercury content: Skipjack (chunk light in canned form).