Can Dogs Eat Tuna?

Conditional: dogs can eat tuna in moderation — canned in water as an occasional treat. Watch mercury, spoiled-fish (scombroid), bones, and excess oil.

Quick Safety Summary

• Verdict: CONDITIONAL — dogs can eat tuna occasionally in small amounts, preferably low‑mercury canned light tuna in water. Avoid frequent feeding, raw or spoiled tuna, and bones. Monitor portion sizes by weight.
• Main risks: mercury accumulation with frequent feeding, bacterial/parasite risk from raw fish, scombroid (histamine) poisoning from spoiled tuna, choking/bowel obstruction from bones, and high calories/fat from oil-packed tuna.
• Emergency: if your dog ate a large amount of tuna (especially albacore/white tuna), or shows vomiting, diarrhea, facial swelling, tremors, weakness, or neurological signs, contact your veterinarian or the ASPCA Animal Poison Control (888-426-4435) immediately.

Can dogs eat tuna? Short verdict

Conditional: yes, dogs can eat small amounts of tuna as an occasional treat, but it should not be a regular part of their diet because of mercury and other risks. Prefer canned light tuna in water, served plain and in small portions based on your dog's weight.

Why tuna is tempting — and what it offers

Tuna is high in protein and contains beneficial omega-3 fatty acids (EPA and DHA), which support skin and coat health, joint mobility, and reduce inflammation when provided appropriately. Typical nutrition for canned light tuna (drained, per 100 g) is roughly:

• Protein: ~25–30 g
• Fat: ~1–3 g (varies by packing)
• Calories: ~100–130 kcal
• Combined EPA+DHA: roughly 200–400 mg (0.2–0.4 g), depending on species and processing

Main risks and toxicology

Mercury (methylmercury) — the primary long‑term concern

Tuna, especially larger species like albacore (white tuna), contains measurable methylmercury. The U.S. FDA reports average mercury levels roughly:

• Light (skipjack) canned tuna: ~0.12 parts per million (ppm)
• Albacore (white) canned tuna: ~0.32 ppm

Scombroid (histamine) poisoning — spoiled tuna

Tuna can develop high histamine levels when improperly stored or spoiled. Scombroid poisoning causes acute symptoms similar to an allergic reaction: facial swelling, vomiting, diarrhea, abdominal pain, rapid heartbeat, and respiratory distress. This is an emergency — seek veterinary care immediately. (Source: AVMA/food safety references.)

Raw fish and parasites/bacteria

Feeding raw tuna can expose dogs to parasites (like Anisakis), Salmonella, and Listeria. Dogs are more tolerant than humans sometimes, but raw fish still carries an infection risk. Freezing and proper cooking mitigates these risks.

Bones and choking

Fresh tuna bones (and larger fish bones) can splinter and cause choking, mouth or throat injury, or gastrointestinal perforation. Always remove bones and avoid giving cooked bones.

Canned tuna in water vs oil

• Canned in water: Lower in calories and fat, easier to mix into food, and generally a better occasional choice for dogs. Drained tuna reduces excess sodium from brines.
• Canned in oil: Higher calories and fat; if used occasionally for a high‑calorie treat it’s acceptable, but avoid frequent feeding (can contribute to pancreatitis or weight gain). Rinse if you want to reduce oil and sodium.

Fresh or raw tuna: preparation and risks

• Cook thoroughly to kill parasites and bacteria. Baking or poaching without added seasonings is best.
• Remove skin, bones, and excess fat. Do not feed raw tuna unless frozen to the appropriate temperature to kill parasites and you understand the risks.
• Never feed seasoned tuna (garlic, onion, excessive salt, sauces) — garlic and onion are toxic to dogs.

Serving sizes and frequency guidelines

Because mercury accumulates, frequency and portion sizes should be conservative. The tables below are practical recommendations for canned light tuna in water (no added salt) as an occasional treat. If feeding albacore/white tuna, halve the frequency.

Suggested serving (canned light tuna in water, plain):

• Toy/small dogs (up to 10 lb / 4.5 kg): 1 teaspoon — once every 1–2 weeks
• Small dogs (10–25 lb / 4.5–11 kg): 1 tablespoon — once per week
• Medium dogs (25–50 lb / 11–23 kg): 2 tablespoons — once per week
• Large dogs (50–90 lb / 23–41 kg): 1–2 ounces (2–4 tablespoons) — once per week
• Giant breeds (90+ lb / 41+ kg): up to 3 ounces — once per week

Safer fish alternatives for regular feeding

If you want to include fish regularly, consider lower‑mercury options that are richer in omega‑3s:

• Salmon (wild or responsibly farmed): high in EPA/DHA, low mercury, excellent for skin/coat. Cooked, boneless salmon is a top choice.
• Sardines (canned in water): low mercury, high omega‑3s and calcium (if canned with soft bones), excellent for regular use.
• Trout: low mercury, good omega‑3 profile.
• Herring and anchovies: nutrient-dense, low mercury, good omega‑3 sources.

What to do in an emergency

If your dog ate a large amount of tuna (especially albacore/white tuna), spoiled tuna, or is showing signs such as vomiting, severe diarrhea, facial swelling, drooling, tremors, incoordination, weakness, or trouble breathing:

Early intervention improves outcomes for acute poisoning or severe reactions.

Bottom line

Tuna can be an occasional, tasty protein source for dogs when given in small amounts, prepared simply, and chosen carefully (prefer canned light tuna in water). Because of mercury and other risks, tuna should not be fed frequently or replace balanced dog food. For regular fish feeding, prefer salmon, sardines, trout, or herring.

Key Takeaways

• Conditional: Safe in moderation — small portions of canned light tuna in water are acceptable as an occasional treat.
• Limit frequency and portion sizes based on dog weight; give albacore (white) tuna less often due to higher mercury.
• Avoid raw/undercooked or spoiled tuna (risk of parasites, bacteria, scombroid/histamine poisoning), and remove bones.
• Prefer low‑sodium, water‑packed tuna; avoid seasoned or oil‑packed varieties for regular use.
• Safer regular fish choices: salmon, sardines, trout, herring.
• If your dog shows vomiting, neurological signs, facial swelling, or severe GI signs after eating tuna, contact your vet or ASPCA Animal Poison Control immediately.

Frequently Asked Questions