Can Dogs Eat Tuna? Benefits, Risks, and How to Feed It Safely
Can Dogs Eat Tuna?
Tuna is a go-to protein for many people — it’s tasty, rich in omega-3s, and easy to store. But can dogs eat tuna too?
Yes, dogs can eat tuna — but in small amounts and not every day. While it offers valuable nutrients, tuna can also pose health risks if given too often, especially for dogs with allergies or sensitivities. In this guide, we break down the pros and cons of tuna for dogs, which dogs should avoid it, how to serve it safely, and we include a free dog-friendly tuna treat recipe at the end.
Nutritional Benefits of Tuna for Dogs
Tuna (particularly skipjack and albacore species) provides:
High-quality protein – vital for muscle maintenance and repair
Omega-3 fatty acids (EPA & DHA) – support for skin, coat, joints, and brain health
B vitamins (B3, B6, B12) – aid in energy metabolism and nerve function
Selenium – a powerful antioxidant
Phosphorus & magnesium – essential for bones and muscle contraction
100g of cooked yellowfin tuna provides:
Protein: 24g | Fat: 1g | Calories: 108 | Carbs: 0g
Health Benefits of Tuna for Dogs
1. Lean, Digestible Protein
Tuna offers a clean, lean protein source that’s perfect as an occasional booster for adult dogs — ideal for picky eaters or those needing a high-reward topper.
2. Omega-3 Powerhouse
Rich in EPA and DHA, tuna can reduce inflammation, aid itchy skin, support cognitive function, and help dogs with arthritis.
📚 In a 2010 study (Roush et al.), dogs with osteoarthritis showed reduced pain and stiffness when given omega-3 fatty acids.
3. Picky Eater Approved
Tuna’s strong smell and flavour make it irresistible for most dogs. It can be helpful for dogs recovering from illness or older dogs with reduced appetite.
4. Naturally Low in Carbs
Great for dogs on low-carb or sensitive diets, tuna contains no starch or sugar.
The Risks of Feeding Tuna to Dogs
Tuna isn’t suitable for every dog — and shouldn’t be a staple protein. Here’s why.
1. Mercury Exposure
Tuna (especially albacore and bluefin) is high on the food chain, meaning it can accumulate mercury — a toxic heavy metal.
Mercury toxicity in dogs can lead to:
Neurological issues (tremors, confusion)
Kidney damage
Immune suppression
A 2004 study by Burger & Gochfeld found that canned albacore tuna often exceeded safe mercury levels for frequent consumption.
Best choice: Skipjack tuna (lower mercury levels)
Avoid: Feeding tuna more than once or twice per week
2. Histamine Sensitivity in Itchy Dogs
Dogs prone to itching, red skin, or chronic allergies often react poorly to tuna due to its high histamine content, especially in canned or improperly stored fish.
Olivry et al. (2020) found histamines in food can worsen pruritus in sensitive dogs.
Avoid tuna if your dog has:
Hot spots, ear infections or chronic itching
Suspected food intolerances
Ongoing elimination diet
3. Sodium Overload from Canned Tuna
Many canned tunas contain added salt, especially those in brine.
Too much salt can cause:
Dehydration
High blood pressure
Kidney strain in senior dogs
Use: Tuna in spring water, low-sodium only
Avoid: Tuna in brine or sunflower oil
Safe Ways to Feed Tuna to Your Dog
Best Tuna Options
Fresh tuna (steamed, poached, or baked — no salt or seasoning)
Canned tuna in spring water (low or no salt, skipjack preferred)
Freeze-dried tuna treats (as occasional reward)
Never Feed:
Raw tuna (risk of parasites)
Tuna in brine or sunflower oil
Tuna-flavoured kibble or wet food (often high in salt and flavour enhancers)
Tuna daily or as a regular protein source
Tuna Serving Size Guide
Use as a topper or occasional treat (1–2 times per week):
Dog SizePortion Size (Cooked Tuna)Small (<10kg)10–15gMedium (10–25kg)20–40gLarge (25kg+)50–75g
When NOT to Feed Tuna
Tuna is not recommended for:
Dogs with chronic skin or allergy issues
Puppies (developing systems are more vulnerable to mercury)
Dogs with kidney disease
Dogs on elimination diets
Free Recipe: Tuna & Sweet Potato Dog Treats
Perfect for training, enrichment toys, or a nutritious bite!
Ingredients:
1 can skipjack tuna in spring water (drained, ~145g)
1 medium sweet potato, cooked and mashed (~150g)
1 egg
40g buckwheat or oat flour (about 1/3 cup)
1 tbsp chopped parsley (optional – great for fresh breath)
Method:
Preheat oven to 160°C / 320°F / Gas Mark 3.
Mix tuna and mashed sweet potato.
Beat the egg, add to mixture.
Stir in flour and parsley until a sticky dough forms.
Spoon blobs or shape into treats on a lined baking tray.
Bake for 18–22 minutes until lightly golden and firm.
Let cool completely. Store in an airtight container in the fridge for 5 days or freeze for longer.
🍽 Makes approx. 25–30 small treats.
Final Thoughts: Should Dogs Eat Tuna?
Tuna can be a nutritious, high-value treat in small amounts, but it’s not right for every dog. It should never be a daily protein source.
Feed Tuna If:
Your dog is healthy and tolerates fish
You want a tasty topper or reward
It’s served once or twice a week
Avoid Tuna If:
Your dog has skin allergies or chronic itching
They are on a restricted or elimination diet
They are a puppy or have kidney disease
Want More Balanced Fish Recipes?
Inside The Canine Code, you’ll find:
Exclusive, balanced home-cooked fish-based meals
Vet-reviewed nutrition guides and tools
Our interactive Calorie Calculator
Live Q&As and community support from real experts
If you need personalised advice regarding your dog’s diet or health, feel free to reach out to The Canine Dietitian at www.thecaninedietitian.co.uk. Or click here for a FREE diet assessment. We’re here to help ensure your dog gets the best nutrition possible!