Omega-3 Supplements for Dogs in Canada 2026: Fish Oil vs Herring Oil vs Krill Oil — Which Is Best?

Omega-3 fatty acids are among the most research-backed nutritional additions a dog owner can make to their pet's diet. As of 2026, Canadian dog owners shopping for the right supplement face a genuinely confusing shelf: fish oil, herring oil, and krill oil all promise coat, joint, and brain benefits — but the source, bioavailability, and ideal use case differ meaningfully between them. If you're trying to pick the right omega-3 supplement for your dog, this guide breaks down what the science says and what our team at Ashario Pets recommends based on the dogs we see every day at our North York location. You can start by browsing our dog health and wellness collection to see what's currently in stock.

Whether your dog is a senior Golden Retriever dealing with stiff joints, a young Husky with a dull coat, or a rescue with a sensitive digestive system, the omega-3 source you choose can make a real difference. Let's compare all three formats clearly and honestly.

Why Do Dogs Need Omega-3 Fatty Acids?

Dogs require omega-3 fatty acids — specifically EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) — because their bodies cannot synthesize adequate amounts on their own. These long-chain fatty acids support skin and coat health, joint lubrication, cognitive function, and healthy inflammatory response. According to AAFCO nutrient profiles, commercial dog foods must meet minimum fat requirements, but they do not mandate specific EPA/DHA levels — making supplementation especially relevant for dogs eating even well-formulated kibble.

Research published through the National Center for Biotechnology Information (NCBI) has documented that EPA and DHA supplementation in dogs can reduce markers of joint inflammation, improve skin barrier function, and support neurological development in puppies. The typical therapeutic dosage range cited in veterinary literature is 20–55 mg of EPA+DHA combined per kilogram of body weight per day, though the exact recommendation depends on the condition being addressed. Always consult your veterinarian before starting any supplement regimen.

Key Takeaway: Dogs cannot manufacture sufficient EPA and DHA independently. Supplementing with a quality omega-3 source — dosed at roughly 20–55 mg EPA+DHA per kg body weight daily — fills a gap that most commercial diets leave open, supporting coat, joint, and cognitive health.

Fish Oil for Dogs: The Classic Choice

Standard fish oil — typically derived from anchovies, sardines, or salmon — is the most widely used omega-3 supplement for dogs in Canada. It delivers EPA and DHA in triglyceride or ethyl ester form and is available in liquid, capsule, and pump formats. A typical 1,000 mg fish oil softgel provides approximately 180 mg EPA and 120 mg DHA, though concentrations vary significantly by brand and species source.

Our nutrition team at the Ashario Pets North York store recommends fish oil most often for dogs that need a straightforward, budget-accessible entry point into omega-3 supplementation. It's the format most dogs tolerate well, and it mixes easily into dry dog food or wet meals. The main drawback is oxidation: fish oil degrades relatively quickly when exposed to air and heat, which means proper storage and freshness dating matter enormously. Rancid fish oil delivers oxidized lipids — the opposite of a health benefit.

Brands like MOJO Pet Supplements and Canine Life, both available at Ashario Pets, formulate their omega-3 products with freshness in mind, using nitrogen flushing or dark packaging to slow oxidation. When a customer comes into our store asking about fish oil for their dog's itchy skin or dull coat, we walk them through label reading: look for a guaranteed analysis listing EPA and DHA separately, and check the best-before date carefully.

Herring Oil for Dogs: The Canadian Underdog Worth Knowing

Herring oil is an omega-3 source derived specifically from Atlantic or Pacific herring, and it punches above its weight in terms of EPA and DHA concentration per gram of fat. Quality herring oil typically contains 10–12% EPA and 6–8% DHA by weight — somewhat comparable to salmon oil, but herring is a shorter-lived, smaller fish that bioaccumulates significantly fewer heavy metals and environmental contaminants than larger species.

This matters in Canada. Atlantic herring is one of the most sustainably harvested cold-water fish in the world, with Canadian fisheries operating under tight Department of Fisheries and Oceans (DFO) quotas. For owners who care about both efficacy and environmental impact, herring oil is a compelling option. The omega-6 to omega-3 ratio in herring oil also tends to be more favourable than in many processed fish oils, which supports a healthier inflammatory balance in dogs consuming grain-based kibble (grain-based diets already tend to be high in omega-6 linoleic acid).

Pet owners tell us that dogs find herring oil highly palatable — even finicky eaters tend to accept it readily. At our North York store, we see strong interest in herring oil particularly from owners feeding raw dog food, who want a complementary omega-3 boost without overcomplicating an already protein-rich diet. Brands like Canine Matrix and Wellytails — both stocked at Ashario Pets — include herring-derived marine lipid profiles in their supplement formulations.

Krill Oil for Dogs: The Premium Bioavailability Option

Krill oil is derived from Antarctic krill (Euphausia superba), tiny crustaceans that sit at the very base of the marine food chain. What makes krill oil genuinely different from fish and herring oil isn't the total EPA/DHA content — krill oil actually contains less per millilitre on average — but the form in which those fatty acids are delivered. In krill oil, EPA and DHA are bound to phospholipids rather than triglycerides, and phospholipid-bound omega-3s are absorbed more efficiently across cell membranes.

Studies indexed on NCBI/PubMed suggest phospholipid omega-3s achieve higher plasma concentrations at lower doses compared to triglyceride-form fish oils, though research specifically in dogs is less extensive than human trials. A typical krill oil supplement for dogs might deliver 150–250 mg EPA+DHA per 500 mg serving, but the phospholipid carrier means the effective cellular uptake may rival a larger dose of standard fish oil. Krill oil also naturally contains astaxanthin, a potent antioxidant that helps stabilize the oil and may offer additional anti-inflammatory support.

The drawback? Cost. Krill oil is meaningfully more expensive per gram of EPA+DHA than fish or herring oil, and Antarctic krill harvesting, while regulated, remains a topic of ecological debate. For large-breed dogs requiring higher daily EPA+DHA doses — for example, a 40 kg Labrador needing upward of 800–2,200 mg EPA+DHA daily for joint support — krill oil can become very expensive very quickly. Our team typically recommends krill oil for smaller dogs, dogs with absorption concerns (older dogs with digestive changes), or owners who specifically want the phospholipid advantage and astaxanthin co-benefit.

Fish Oil vs Herring Oil vs Krill Oil for Dogs: A Direct Comparison

Understanding the practical differences between these three omega-3 sources helps you match the right supplement to your dog's needs, size, and health goals. Here is a structured breakdown across the key decision factors:

• Primary omega-3 source — Standard fish oil: Anchovy, sardine, or salmon; triglyceride or ethyl ester form; widely available and typically the most affordable per gram of EPA+DHA.
• Primary omega-3 source — Herring oil: Atlantic or Pacific herring; triglyceride form; strong EPA/DHA concentration, low contamination risk, excellent palatability for most dogs.
• Primary omega-3 source — Krill oil: Antarctic krill; phospholipid form; lower absolute EPA+DHA per serving but higher bioavailability; includes astaxanthin antioxidant naturally.
• Best suited for — Standard fish oil: Medium to large dogs needing a cost-effective daily supplement; dogs on dry kibble with a low overall omega-3 profile.
• Best suited for — Herring oil: Dogs on raw or fresh-food diets needing a clean, low-contaminant top-up; owners prioritizing sustainability and palatability.
• Best suited for — Krill oil: Small dogs, senior dogs with absorption issues, or owners seeking maximum cellular uptake per dose with antioxidant co-support.
• Oxidation stability — Standard fish oil: Moderate; degrades faster without nitrogen flushing; always check freshness dating and store in a cool, dark location.
• Oxidation stability — Herring oil: Good; naturally higher antioxidant content than many processed fish oils; still benefits from refrigeration after opening.
• Oxidation stability — Krill oil: Excellent; astaxanthin acts as a natural preservative, giving krill oil a notably longer shelf stability than fish or herring oil.
• Environmental profile — Standard fish oil: Varies widely by source; look for MSC-certified or sustainably sourced labels.
• Environmental profile — Herring oil: Generally strong; herring is one of the most sustainably managed wild fisheries in Canada and the North Atlantic.
• Environmental profile — Krill oil: Certified sustainable under CCAMLR regulations; very low on the food chain minimizes contaminant bioaccumulation.
• Price tier (relative, Canada 2026) — Standard fish oil: $ (most accessible).
• Price tier (relative, Canada 2026) — Herring oil: $$ (mid-range).
• Price tier (relative, Canada 2026) — Krill oil: $$$ (premium).

All three formats are available through our dog health and wellness section at Ashario Pets, with brands including MOJO Pet Supplements, Canine Matrix, Canine Life, and Wellytails.

How to Choose the Right Omega-3 Supplement for Your Dog in 2026

The right omega-3 supplement depends on your dog's size, current diet, health status, and your budget. Here's a practical decision framework our nutrition team uses at the North York store:

Start by looking at your dog's existing food. If you're feeding a high-quality raw dog food from brands like Big Country Raw, Open Farm, or Instinct Raw, your dog is already receiving meaningful levels of omega-3 from whole prey ingredients — a small herring oil or krill oil top-up may be all that's needed. If you're feeding a standard dry kibble — even a premium one — omega-3 content is typically low after the heat processing of extrusion, and a more substantial fish oil or herring oil supplement makes more sense.

For dogs with diagnosed joint conditions, coat issues, or skin allergies, consult your veterinarian about therapeutic dosing. Research suggests joint support in dogs may require EPA+DHA doses of 40–100 mg per kg body weight daily — meaningfully higher than a basic maintenance dose of 20 mg per kg. A 25 kg dog targeting joint support would need approximately 1,000–2,500 mg EPA+DHA daily, which adds up quickly with krill oil capsules. Fish or herring oil in liquid form is often the most practical delivery method at these volumes.

Life-stage matters too. DHA supports neurological development in puppies — look for supplements with a clear DHA guarantee analysis on the label. Senior dogs often benefit from the combined anti-inflammatory properties of EPA and the phospholipid form's improved absorption, making krill oil a reasonable consideration despite the cost premium. You can explore our full range of options when you browse our best pet food and supplement picks for specific needs.

Frequently Asked Questions: Omega-3 Supplements for Dogs in Canada

What is the best omega-3 supplement for dogs in Canada in 2026 — fish oil, herring oil, or krill oil?

There is no single "best" omega-3 supplement for all dogs — the right choice depends on your dog's size, diet, and health needs. Fish oil is the most cost-effective for large dogs needing higher daily EPA+DHA doses. Herring oil offers a clean, palatable, low-contaminant option well-suited to raw-fed dogs. Krill oil delivers superior bioavailability due to its phospholipid form and includes the antioxidant astaxanthin, making it ideal for small dogs or seniors — but it carries a higher price per dose. All three are legitimate, research-supported omega-3 sources available at Ashario Pets in North York. Consult your veterinarian for a dosage specific to your dog's weight and condition.

How much omega-3 should I give my dog daily?

A general maintenance dose for healthy adult dogs is approximately 20 mg of combined EPA+DHA per kilogram of body weight per day. For therapeutic purposes — such as supporting joint health or managing skin conditions — veterinary literature suggests dosing of 40–100 mg EPA+DHA per kg body weight daily. A 10 kg dog on maintenance supplementation needs roughly 200 mg EPA+DHA daily; a 30 kg dog targeting joint support may need 1,200–3,000 mg EPA+DHA daily. Always verify dosing with your veterinarian, and read the guaranteed analysis on your supplement label to confirm actual EPA+DHA content per serving.

Is krill oil safe for dogs with shellfish sensitivities?

Krill are crustaceans, so dogs with confirmed shellfish or crustacean protein allergies should avoid krill oil and instead use fish or herring oil as their omega-3 source. If your dog has a documented food sensitivity history, discuss the supplement choice with your veterinarian before introducing any new product. For dogs without shellfish sensitivities, krill oil is generally very well tolerated. The American Veterinary Medical Association (AVMA) recommends discussing any new supplement additions with your dog's veterinarian, particularly if your dog is on concurrent medications.

Can I add omega-3 oil to my dog's raw food or kibble?

Yes — liquid omega-3 oils (fish oil, herring oil, or krill oil in pump or dropper form) mix easily into both raw dog food and dry kibble. For raw-fed dogs, the oil integrates naturally with the meal's existing fat content. For kibble-fed dogs, adding the oil immediately before serving helps minimize oxidation exposure. Avoid pre-mixing a large batch, as the oil will degrade more quickly once combined with food. Store open bottles of fish or herring oil in the refrigerator; krill oil capsules can be stored at room temperature due to their natural astaxanthin stability. Learn more about supplementing with our complete dog wellness guide.

Where can I buy omega-3 supplements for my dog in North York or the GTA?

Ashario Pets at 1111A Finch Ave W, Unit 2, North York, ON M3J 2P7 carries a curated selection of omega-3 and pet wellness supplements year-round. The store is open 7:00 AM to 11:00 PM daily, 365 days a year, including holidays. GTA residents can also order for same-day delivery via Uber Eats, DoorDash, SkipTheDishes, Instacart, or Fantuan. Call ahead at +1-647-564-4433 to confirm current stock on a specific brand or formula, or contact Ashario Pets online.