Can Dogs Eat Tuna? Here's The Truth

So, you’re making yourself a tuna sandwich, and—surprise, surprise—your dog is staring at you like you owe them a bite. Now you’re wondering: Can dogs eat tuna, or will this turn into a fishy disaster?

The short answer? Yes, but only in small amounts and not every day. Tuna isn’t toxic to dogs, but it comes with risks, especially when it comes to mercury levels.

Let’s break it down before your pup gets their paws on your lunch.

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🐟 Is Tuna Safe for Dogs?

Technically, yes. Dogs can eat tuna—but moderation is key. Unlike other fish like salmon or whitefish, tuna tends to have higher mercury levels, which can be harmful over time.

That said, if your dog steals a bite of your tuna sandwich, it’s not the end of the world (unless they also got the bread, mayo, and pickles—then we’ve got other issues).

🐶 The Benefits of Tuna for Dogs

If given in small amounts, tuna can be a nutritious treat for your pup. Here’s why:

1. Packed with Protein 💪

Tuna is loaded with high-quality protein, which helps build strong muscles and supports a healthy coat.

2. Omega-3 Fatty Acids = Healthy Skin & Coat 🐾

Tuna is rich in omega-3 fatty acids, which can:
✔ Improve skin health
✔ Reduce inflammation
✔ Make your dog’s coat extra shiny (because who doesn’t want a glamorous pup?)

3. Low in Fat, High in Nutrients

If you’re looking for a lean protein source, tuna is low in fat and packed with vitamins like B12, D, and selenium.

⚠️ The Risks of Feeding Tuna to Dogs

Alright, here’s where things get tricky. While tuna isn’t toxic, it does have some potential dangers.

1. Mercury Poisoning – The Big Concern 🚨

Tuna, especially big species like albacore and yellowfin, contains higher levels of mercury compared to other fish. If a dog eats too much tuna over time, they risk mercury poisoning, which can cause:
❌ Loss of coordination
❌ Kidney damage
❌ Vision problems
❌ Neurological issues

If you’re feeding tuna to your dog, keep it occasional—not a daily meal.

2. Canned Tuna Can Be Tricky 🥫

If you’re thinking of giving your dog canned tuna, read the label first. Some types can be problematic:

Tuna in oil – Too much fat, which can lead to pancreatitis. Stick to tuna in water.
Tuna with added salt – High sodium levels aren’t great for dogs.
Flavored or seasoned tuna – Garlic, onion, and spices? Hard no.

3. Can Be Hard to Digest 🤢

Some dogs have sensitive stomachs, and tuna—especially if they’re not used to eating fish—can cause vomiting or diarrhea.

🥄 How to Safely Feed Tuna to Your Dog

If you’re going to give your dog tuna, follow these rules:

✅ Keep it plain. No mayo, no spices, no fancy sauces.
✅ Go for canned tuna in water. Avoid tuna in oil or with extra salt.
✅ Give only small portions. A bite here and there is fine—just don’t overdo it.
✅ Stick to fresh or light tuna. Skip albacore or yellowfin due to higher mercury levels.

🐾 How Much Tuna Can Dogs Eat?

The right portion depends on your dog’s size. Here’s a quick guide:

Dog Size	Max Tuna (Per Week)
🐶 Small Dogs (Chihuahua, Yorkie)	A bite or two
🐕 Medium Dogs (Cocker Spaniel, Beagle)	1–2 teaspoons
🐕‍🦺 Large Dogs (Labrador, Golden Retriever)	Up to 1 tablespoon

👉 Rule of thumb: Tuna should make up less than 10% of your dog’s diet and be an occasional treat.

❓ What About Other Fish?

If you’re looking for safer fish options for your dog, try these instead:

Fish	Safe for Dogs?	Notes
🐟 Salmon	✅ Yes	Rich in omega-3s, but must be cooked (raw salmon can have parasites).
🐟 Sardines	✅ Yes	Low in mercury, great for dogs. Bonus: Small bones add calcium!
🐟 Tilapia	✅ Yes	Mild, easy to digest. Cooked only.
🐟 Cod	✅ Yes	Lean and safe.
🐟 Mackerel	✅ Yes (but small portions)	Stick to Atlantic mackerel (lower mercury) and avoid King mackerel.
🐟 Tuna	⚠️ In Moderation	High in mercury—give occasionally.

Winner? Sardines! They’re low in mercury, super nutritious, and dogs love them.

🏆 Final Verdict: Can Dogs Eat Tuna?

✅ Yes, but in moderation.
✅ Go for light tuna in water, no seasoning.
✅ Small amounts only—too much can lead to mercury buildup.
✅ Better fish choices? Salmon, sardines, or tilapia.

So if your dog steals a bite of tuna, don’t panic. But if you’re looking for a regular fish treat, go for something safer, like sardines or cooked salmon.

Now, if you’ll excuse me, I need to protect my tuna sandwich before my dog gets any ideas. 🐶🐟

David

I’ve spent 10+ years in dog training, digging into what makes dogs (and their humans) tick. At Smart Dog Learning, I share my no-nonsense, fun approach to training so you can enjoy life with a well-behaved, happy pup—no boring lectures, just practical results 😉

Can Dogs Eat Tuna? Here’s The Truth

🐟 Is Tuna Safe for Dogs?