How Much Fish Oil Can I Give My Dog? EPA and DHA Dosage by Body Weight in Canada

Most dogs do well on roughly 50 to 75 mg of combined EPA and DHA per kilogram of body weight daily for skin and joint support — about 500 to 750 mg for a 10 kg dog. Stay below the published safe ceiling of 370 mg per kilogram of metabolic body weight, and confirm the dose with your veterinarian before starting.

That one distinction — combined EPA plus DHA, not total "fish oil" — is where nearly every dosing mistake begins. A 1,000 mg softgel typically delivers only about 300 mg of actual omega-3s, so the number on the front of the bottle and the number that matters are rarely the same. If you're already comparing labels, you can shop dog health and wellness supplements where the guaranteed analysis is listed for each product, and cross-check our broader guide to dog health supplements before you commit to a bottle size.

What the standards say about EPA and DHA for dogs

AAFCO requires a minimum of 0.05% combined EPA and DHA on a dry-matter basis in dog foods formulated for growth and reproduction, plus 0.08% alpha-linolenic acid — but sets no equivalent minimum for adult maintenance diets. In plain terms, an adult kibble can legally contain almost no marine omega-3 and still meet AAFCO standards.

The AAFCO dog food nutrient profiles, carried into the 2026 Official Publication without changes to the fatty-acid section, also cap the omega-6 to omega-3 ratio at 30:1. Most grain-inclusive and grain-free dry foods land between 10:1 and 20:1, because chicken fat, poultry meal, and sunflower or canola oil are heavy in linoleic acid. Adding EPA and DHA moves that ratio downward, toward the range researchers associate with reduced inflammatory signalling.

The upper limit comes from the National Research Council: 370 mg of combined EPA and DHA per kilogram of metabolic body weight (body weight in kg raised to the 0.75 power) per day. Practically, that's roughly 2,080 mg for a 10 kg dog and about 5,880 mg for a 40 kg dog. Sustained doses above that have been linked in veterinary literature to impaired platelet aggregation and delayed wound healing. Canine osteoarthritis trials indexed on PubMed, including review work published in 2024, cluster their effective dosing between 50 and 100 mg/kg of body weight daily.

EPA and DHA dosage dog weight chart

Use the general skin-and-joint range of 50–75 mg/kg of combined EPA+DHA per day, and treat the second figure as a hard ceiling rather than a target:

• 5 kg / 11 lb — about 250–375 mg EPA+DHA daily; NRC ceiling near 1,235 mg
• 10 kg / 22 lb — about 500–750 mg daily; ceiling near 2,080 mg
• 20 kg / 44 lb — about 1,000–1,500 mg daily; ceiling near 3,500 mg
• 30 kg / 66 lb — about 1,500–2,250 mg daily; ceiling near 4,740 mg
• 40 kg / 88 lb — about 2,000–3,000 mg daily; ceiling near 5,880 mg

Two things that get overlooked. Calories: one teaspoon (5 ml) of fish oil carries roughly 40–45 kcal, so a large dog on two teaspoons a day is eating an extra 80–90 kcal — meaningful for a dog already above ideal body condition. And medication interactions: both the Canadian Veterinary Medical Association and the AVMA advise discussing supplements with your veterinarian, particularly for dogs on anticoagulants, dogs with a pancreatitis history, or any dog scheduled for surgery within two weeks.

What we see in the store when owners ask about fish oil

The most common error we correct at the counter is dosing by capsule count instead of by milligrams of EPA and DHA. Pet owners tell us they're giving "two fish oil pills a day" to a 35 kg shepherd — that's often only 600 mg of real omega-3s, under a third of what the published research range suggests for a dog that size.

Our nutrition team at the North York store runs the same three checks every time someone brings a bottle to the till. First, we read the supplement facts panel for milligrams of EPA and DHA per pump, scoop, or capsule — not the total oil weight. Second, we look for mixed tocopherols (vitamin E), since marine oils oxidize fast once air hits them. Third, we ask what's already in the bowl: a dog eating a salmon-forward formula from our raw dog food selection or a whole-fish air-dried dog food already has a meaningful omega-3 baseline, and stacking a full supplement dose on top can push past what that dog needs.

The seasonal pattern here is impossible to miss. From November through March, when forced-air heating drops indoor humidity, we see a steady wave of owners describing flaky skin, dull coats, and dogs chewing at the base of the tail after a cold loop around Earl Bales Park. Fish oil isn't a universal answer for itch — fleas, yeast, and environmental allergens all look similar from the outside — but omega-3s remain one of the few interventions with consistent published support for coat quality and inflammatory skin comfort.

Our team at Ashario Pets recommends pairing EPA and DHA with a glucosamine-based joint formula for arthritic seniors rather than relying on fish oil alone; in our experience owners report steadier results from the combination over an 8 to 12 week window. You'll find us at 1111A Finch Ave W, Unit 2, North York, ON M3J 2P7 (open 7 AM to 11 PM daily); most GTA addresses can get same-day delivery through SkipTheDishes or a similar app.

Fish oil for dogs: your questions answered

Can I give my dog human fish oil capsules?

Yes — plain human fish oil softgels are generally acceptable for dogs as long as the only ingredients are fish oil and vitamin E, with no xylitol, flavourings, or added botanicals. A standard 1,000 mg capsule supplies roughly 180 mg EPA and 120 mg DHA, about 300 mg combined. Avoid cod liver oil entirely.

The cod liver oil caution deserves repeating. It can contain 1,000–1,500 IU of vitamin A per teaspoon, and chronic oversupply of retinol is associated with skeletal abnormalities in dogs. If you want omega-3s without the vitamin A load, choose a body oil pressed from sardine, anchovy, salmon, or mackerel rather than a liver oil.

What is the fish oil for itchy dogs dosage, and how long until it works?

Start at the standard 50–75 mg/kg of combined EPA and DHA daily, then allow 6 to 12 weeks before judging results. Omega-3 fatty acids incorporate into cell membranes gradually. Most owners who report improvement notice a glossier coat around week 4 and reduced scratching closer to week 8.

If there's no change at all by the three-month mark on an appropriate dose, the itch probably isn't primarily responsive to dietary fatty acids. The ASPCA and most veterinary dermatologists would steer you toward a structured allergy workup at that point. Our dog blog covers how to separate environmental triggers from food triggers before you start swapping bags, and the dog wellness needs guide maps supplements to specific symptom patterns.

What are the side effects of too much fish oil in dogs?

Overdosing usually presents as loose stool, fishy breath, and a greasy coat. At sustained high doses the concerns get more serious: prolonged bleeding time from reduced platelet aggregation, delayed wound healing, and vitamin E depletion. High added fat can also provoke GI upset in dogs predisposed to pancreatitis.

Introduce fish oil at roughly one-quarter of the target dose for the first week, then build up over 10 to 14 days. Dogs with any pancreatitis history need veterinary clearance before added fat of any kind — a full teaspoon represents a significant fat-content increase for a 6 kg dog on a restricted diet.

Is salmon oil the same as fish oil for dogs?

Salmon oil is one type of fish oil, but its EPA and DHA concentration is usually lower than anchovy or sardine-based oils. Many salmon oils supply 80–150 mg of combined EPA+DHA per 5 ml teaspoon, while concentrated marine oils deliver 400 mg or more per equivalent serving. Compare the milligram figure, never the species name.

Sourcing matters too. Small forage fish such as anchovy and sardine sit low on the food chain, which generally correlates with lower heavy-metal accumulation. The FDA Center for Veterinary Medicine maintains reporting channels for supplement-related adverse events, and credible manufacturers publish third-party purity and peroxide-value testing on request.

How to choose the right omega-3 for dogs in Canada

Choose your format based on two things: whether your dog will actually eat it, and whether you can measure a precise dose. Pump bottles allow fine control for dogs under 10 kg, powders and soft chews suit dogs who spit out oil, and capsules travel well but make half-doses awkward. Buy a bottle you'll finish within 60–90 days of opening.

Two Canadian supplement lines come up constantly in conversations about joint and skin support, and they serve genuinely different owners:

Storage is the step most owners skip entirely. Fish oil oxidizes on contact with air, light, and heat, and an oil that smells sharply rancid has lost potency while gaining the capacity to upset a stomach. Refrigerate after opening, and don't leave a pump bottle on a sunny windowsill through a humid July week.

Fitting fish oil into the rest of the bowl

Supplement dosing should always account for what the diet already supplies. A fish-first air-dried or raw formula may contribute 200–500 mg of EPA and DHA per daily ration for a mid-size dog, which means a full supplement dose on top could overshoot the 50–75 mg/kg target without you realizing it.

Brands built around whole fish — ZIWI, Open Farm, Acana, Orijen, and The New Zealand Natural Pet Food Co among them — publish fatty-acid figures in their guaranteed analysis, and so do several of the limited ingredient lines we stock. If you're rebuilding a diet from the ground up for a dog with chronic skin issues, start with our best pet food for specific needs guide, then browse dry dog food formulas with the omega-3 content printed on the panel. Owners who prefer Canadian-made options can also compare made in Canada pet products side by side.

One last practical point: body condition drives the whole calculation. Dose to your dog's ideal weight, not current weight, if your dog is carrying extra kilos — a 28 kg lab who should be 24 kg gets dosed at 24 kg. And re-check the math twice a year, because a growing puppy's requirement shifts fast between 4 and 12 months.

Key takeaway: Aim for 50–75 mg of combined EPA and DHA per kg of body weight daily and never exceed roughly 370 mg per kg of metabolic body weight. Read the supplement facts panel for actual EPA+DHA milligrams rather than counting capsules, and give any new regimen 6 to 12 weeks before judging coat or mobility results. Discuss dosing with your veterinarian first, especially for dogs on blood thinners or with a pancreatitis history.

Still unsure which bottle fits your dog?

Bring your current food bag and your dog's weight, and our staff will run the EPA+DHA math with you at the counter — it takes about three minutes. You can also reach us through the contact page, check the pet store FAQ for ordering details, or read what other owners say in our customer reviews. Nothing here replaces your veterinarian's guidance on a specific health concern.