Wellytails Salmon Oil vs Krill Oil vs Herring Oil: Best Omega Supplement for Dogs in Canada 2026

Not every fish oil is the same. If you've been standing in a pet store aisle — or scrolling through supplement options online — trying to figure out whether salmon oil, krill oil, or herring oil is the right omega-3 source for your dog, you're not alone. At Ashario Pets in North York, it's one of the most common questions our team hears from dog owners every week. This guide breaks down exactly how these three omega sources differ, what the science says, and which format makes the most sense for your dog's specific needs in 2026.

Ashario Pets, located at 1111A Finch Ave W, Unit 2, North York, ON, carries dog health and wellness supplements from a curated selection of premium brands — including Wellytails, one of the most talked-about omega supplement lines among Canadian dog owners right now. You can also browse all dog products online or have them delivered via Uber Eats, DoorDash, or SkipTheDishes.

Key Takeaway: Salmon oil delivers high EPA and DHA in a cost-effective liquid form ideal for most adult dogs. Krill oil adds astaxanthin and superior bioavailability in a smaller daily dose. Herring oil is a cold-water, sustainable alternative with a clean omega-3 profile. All three support coat health, joint mobility, and inflammation management — but the right pick depends on your dog's size, life stage, and any existing health considerations.

Why Omega-3 Supplements Matter for Canadian Dogs

Omega-3 fatty acids — specifically EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) — are essential nutrients that dogs cannot produce in adequate quantities on their own. According to AAFCO (the Association of American Feed Control Officials), complete adult dog food must contain a minimum fat content to support energy and fat-soluble vitamins, but there is no mandatory minimum for EPA and DHA specifically — meaning most commercial kibble leaves your dog significantly under-supplemented on these critical fats.

The American Kennel Club reports that omega-3 fatty acids actively support skin and coat condition, reduce inflammation associated with arthritis and joint disease, assist brain development in puppies, and support cardiovascular health in aging dogs. Research published on the National Center for Biotechnology Information (NCBI / PubMed) database has consistently shown EPA supplementation at 40–100 mg per kg of body weight per day produces measurable anti-inflammatory effects in dogs, with DHA at similar doses improving cognitive function in senior animals.

For Toronto-area dog owners, another factor matters: Canadian winters are long, sunlight-dependent vitamin D synthesis is reduced, and dogs spending less time outdoors may experience skin dryness and coat dullness that omega-3 supplementation directly addresses. Our nutrition experts at the North York store recommend starting omega-3 supplementation for most dogs from 12 months of age onward, adjusting dose based on body weight and life-stage formulation needs.

Wellytails Salmon Oil for Dogs: What Makes It Stand Out?

Wellytails Salmon Oil is a liquid omega-3 supplement sourced from wild salmon, delivering high concentrations of EPA and DHA in a format that mixes easily into any dry, wet, raw, or freeze-dried meal. Salmon oil is the most established fish oil format in canine nutrition and typically provides 120–180 mg of combined EPA+DHA per millilitre, depending on the concentration of the specific product.

Salmon is rich in omega-6 as well as omega-3, which is important context. The goal in canine nutrition is not just absolute omega-3 intake but the omega-6 to omega-3 ratio. Most commercial dry dog food delivers a ratio of 10:1 to 20:1 omega-6 to omega-3, whereas the research-supported target is closer to 5:1 or lower. Adding Wellytails Salmon Oil to your dog's daily meal helps shift that ratio toward the healthier range by increasing EPA and DHA intake without significantly spiking omega-6.

Salmon oil is also a natural source of fat-soluble vitamins including vitamin D3 and vitamin E, both of which contribute to immune function and cellular health. For large-breed dogs (25 kg and up), a typical starting dose is 1 tsp (approximately 5 mL) per day, providing roughly 600–900 mg of combined EPA+DHA. Smaller dogs under 10 kg typically start at ¼ to ½ tsp daily. Always confirm exact dosing with your veterinarian, especially for dogs managing chronic health conditions.

In our store, customers with dogs experiencing dry, flaky coats — a common concern among Golden Retriever and Husky owners on Finch Ave — frequently return within 4–6 weeks reporting visible coat improvements after starting Wellytails Salmon Oil. It's one of our top-recommended dog health supplements.

For a broader overview of omega-3 sources in canine diets, our related guide on the best omega-3 supplements for dogs in Canada 2026 covers sardines, whole-fish toppers, and other complementary options worth considering.

Krill Oil for Dogs: Superior Bioavailability, Smaller Dose

Krill oil is derived from Antarctic krill (Euphausia superba), tiny crustaceans at the base of the marine food chain. Unlike fish oil where EPA and DHA are bound to triglycerides, krill oil delivers these fatty acids primarily in phospholipid form — a structure that is more readily absorbed through the intestinal wall and integrated into cell membranes. Studies suggest krill oil may provide equivalent omega-3 benefit at 30–40% lower doses compared to standard fish oil.

The standout nutrient in krill oil is astaxanthin, a naturally occurring carotenoid antioxidant that gives krill its distinctive red-pink colour. Astaxanthin functions as a built-in preservative (meaning krill oil is significantly more oxidation-resistant than salmon or herring oil), and preliminary research suggests it may have independent anti-inflammatory and immune-modulating effects. A typical therapeutic krill oil dose for a 20 kg dog is approximately 250–500 mg of krill oil per day, delivering 50–100 mg of combined EPA+DHA depending on product concentration.

Krill oil is generally more expensive per bottle than salmon or herring oil, but the lower serving size partially offsets this. It's also naturally lower in contaminants like mercury and PCBs because krill sit so low on the food chain — a meaningful consideration for dogs on long-term daily supplementation. Krill oil tends to be available in soft gel or capsule format, which some dogs accept readily when mixed into wet food or punctured over kibble.

Herring Oil for Dogs: The Cold-Water Sustainable Option

Herring oil is processed from Atlantic or Pacific herring — another cold-water fatty fish with a naturally high omega-3 concentration. Herring typically delivers a slightly higher DHA-to-EPA ratio compared to salmon, which is notable because DHA is the primary structural fatty acid in brain tissue and retinal cells. For puppies, pregnant dogs, and senior dogs experiencing cognitive decline, herring oil's DHA emphasis can be particularly valuable.

A typical herring oil product delivers approximately 150–200 mg combined EPA+DHA per mL, placing it at or above salmon oil in raw omega-3 density. Herring is also considered a more sustainable species than many salmon stocks due to its shorter lifespan and faster reproductive rate — a consideration for environmentally conscious pet owners in Canada.

Herring oil has a milder flavour than salmon oil in some formulations, which can be an advantage for finicky dogs who refuse strongly scented supplements. It mixes well with dry dog food, raw dog food, and wet dog food alike.

Salmon Oil vs Krill Oil vs Herring Oil: Side-by-Side Comparison

As of 2026, here is how the three major omega-3 supplement types compare for dogs across the key factors dog owners in Canada ask about most:

• Salmon Oil — EPA+DHA form: triglyceride; typical dose for 20 kg dog: 5 mL/day; EPA+DHA per serving: ~750 mg; astaxanthin: no; oxidation stability: moderate; sustainability: variable by source; best for: general coat and skin support, budget-conscious daily supplementation; available at Ashario Pets: yes (Wellytails)
• Krill Oil — EPA+DHA form: phospholipid; typical dose for 20 kg dog: 250–500 mg capsule/day; EPA+DHA per serving: ~75–100 mg; astaxanthin: yes (natural); oxidation stability: high; sustainability: highly sustainable (MSC-certified sources); best for: superior absorption, antioxidant support, dogs with sensitive stomachs; available at Ashario Pets: yes (Wellytails)
• Herring Oil — EPA+DHA form: triglyceride; typical dose for 20 kg dog: 4–5 mL/day; EPA+DHA per serving: ~800 mg; astaxanthin: no; oxidation stability: moderate; sustainability: high (fast-reproducing species); best for: high DHA for puppies and seniors, milder flavour for picky dogs; available at Ashario Pets: yes (Wellytails)

Key Takeaway: For most adult dogs, Wellytails Salmon Oil is the practical daily-driver: high EPA+DHA, easy to dose, and well-accepted by dogs. Krill oil is worth the premium for dogs with absorption concerns or those who need antioxidant support. Herring oil is the best fit for puppies, seniors, and dogs where flavour acceptance is a challenge.

How to Choose the Right Omega Supplement for Your Dog

The right omega-3 supplement depends on four things: your dog's size and life stage, the protein content and fat content of their base diet, any existing health conditions, and your budget. Here's how our team at Ashario Pets thinks through these decisions when a customer walks in:

• Puppies and pregnant/nursing dogs: Prioritize DHA. Herring oil or a DHA-enriched salmon oil best supports brain and retinal development. AAFCO recommends a minimum of 0.05% DHA on a dry-matter basis in puppy-formulated diets — supplementation helps reach therapeutic levels above this floor.
• Active adult dogs (1–7 years): Standard Wellytails Salmon Oil at species-appropriate dosing (2% of body weight rule for fat intake across the full diet) is ideal for coat sheen, joint flexibility, and inflammation management.
• Senior dogs (7+ years) with joint stiffness: Higher-dose EPA from salmon or krill oil combined with glucosamine and chondroitin in a joint supplement addresses two pathways simultaneously. Ask our in-store advisors about stacking protocols.
• Dogs with grain-free or limited ingredient diets: These diets often already skew high in animal fat, so confirm the omega-6 to omega-3 ratio in the guaranteed analysis before doubling up on fat-soluble supplements.
• Dogs with fish allergies: True fish allergies in dogs are uncommon but real. If your dog has a confirmed fish protein sensitivity, consult your veterinarian before introducing any fish-derived oil — even highly refined oils contain trace protein fragments.

Our guide to pet food for specific health needs also covers how to pair omega supplementation with the right base diet for dogs managing skin conditions, arthritis, and cognitive aging.

Frequently Asked Questions: Omega Supplements for Dogs in Canada 2026

Is Wellytails salmon oil safe for dogs to take every day?

Yes, Wellytails Salmon Oil is formulated for daily use and is generally well-tolerated by dogs when given at weight-appropriate doses. For a 20 kg adult dog, a typical starting dose is 5 mL per day (approximately 750 mg combined EPA+DHA), mixed directly into food. Dogs new to fish oil supplementation should start at half the recommended dose for the first week to allow the digestive system to adjust. Always consult your veterinarian before beginning daily supplementation if your dog is on any medication, as omega-3 fatty acids can have mild blood-thinning effects at high doses.

Is krill oil better than salmon oil for dogs?

Krill oil is not categorically better than salmon oil — it's differently suited. Krill oil delivers EPA and DHA in phospholipid form, which research suggests absorbs into cell membranes approximately 30–40% more efficiently than the triglyceride form found in salmon and herring oil. This means a smaller dose can achieve comparable effects. Krill oil also contains astaxanthin, a potent antioxidant not present in salmon oil. However, salmon oil provides a higher absolute EPA+DHA per millilitre at a lower cost per serving for larger dogs. For dogs over 30 kg, salmon oil typically offers better cost-efficiency; for smaller dogs or those with digestive sensitivities, krill oil's superior bioavailability makes it worth the premium.

Can I give my dog both salmon oil and krill oil at the same time?

Combining salmon oil and krill oil is generally not necessary and can lead to excessive total fat intake if not carefully dosed. Most dogs benefit fully from one high-quality omega-3 source at the correct weight-based dose. If you feel your dog needs both for specific reasons — such as using krill oil for its astaxanthin content alongside a full EPA+DHA dose from salmon oil — consult your veterinarian first to calculate total daily omega-3 intake and avoid exceeding recommended fat content thresholds for your dog's diet.

What is the best fish oil supplement for dogs available in Canada in 2026?

As of 2026, Wellytails is one of the most consistently recommended omega supplement brands at specialty Canadian pet stores, including Ashario Pets in North York. Wellytails offers salmon oil, krill oil, and herring oil formats, all designed to meet the needs of Canadian dog owners across different life stages and budgets. The best choice depends on your dog's size, current diet, and health goals — but all three Wellytails omega formats meet the key criteria: species-appropriate sourcing, clear guaranteed analysis labelling, and a formulation free from unnecessary additives. You can explore the full range at Ashario Pets' dog health and wellness collection.

How long does it take for fish oil to improve a dog's coat?

Most dog owners notice measurable coat improvement — increased sheen, reduced shedding, and less skin flakiness — within 4 to 8 weeks of consistent daily omega-3 supplementation at correct doses. The timeline varies based on the dog's starting dietary omega-6 to omega-3 ratio, the degree of skin dryness or coat dullness, age, and whether the underlying cause is purely nutritional or involves other factors like environmental allergies. Our team at Ashario Pets recommends taking a photo of your dog's coat before starting supplementation so you have a baseline to compare against at the 6-week mark. If you see no improvement after 8 weeks of consistent dosing, speak to your veterinarian about whether a higher dose or a different supplement format may be warranted. You can also explore our related article on the best omega-3 supplements for dogs in Canada 2026 for additional context on whole-food omega-3 sources.