Nordic Naturals Omega-3 Pet Review: The Better Evidenced Supplement
A Nordic Naturals Omega-3 Pet review: EPA and DHA content, triglyceride form, purity testing, and why dosing fish oil is a veterinary decision.
A liquid fish oil in triglyceride form, and the one supplement category with genuine trial support in arthritic dogs.
The verdict: Buy it if you want a fish oil from a manufacturer that tests every batch and supplies it in the triglyceride form, and your vet has agreed that omega-3 supplementation fits your dog's plan. Skip it if you are going to guess the dose, because fish oil is not harmless at any amount, or if you would give a human supplement instead, which Nordic Naturals specifically advises against. Marine omega-3 has better published support in canine osteoarthritis than most of the joint aisle, but the dose that matters is a therapeutic one and only your vet can set it for your dog.
Nordic Naturals Nordic Naturals Omega-3 Pet Fish Oil for Dogs, 16 oz
~$40
A liquid omega-3 fish oil for dogs supplying 1,380 mg per serving in triglyceride form, made from wild-caught fish and batch tested for purity.
Check price on AmazonSpecifications
| Format | Liquid oil, 16 oz bottle |
|---|---|
| Stated content | 1,380 mg fish oil with EPA and DHA |
| Molecular form | Triglyceride form, which Nordic Naturals states is the form naturally found in fish and is used for absorption |
| Source | Fresh, wild-caught fish |
| Testing | Nordic Naturals states every batch is tested for purity |
| Formulation | Non-GMO, gluten and dairy free, no artificial colors, flavors or preservatives |
| Important note | Nordic Naturals states the pet products should be used for dogs and cats rather than their human products |
Specifications above come from Nordic Naturals' published product information. Treat pricing as approximate, since Amazon pricing moves.
What it does well
- Omega-3 fatty acids from marine sources have a stronger published evidence base in canine osteoarthritis than glucosamine or chondroitin, which makes this the more defensible supplement to spend money on.
- Triglyceride form and batch purity testing, which matter because fish oil quality varies enormously and oxidized oil is worse than none.
- Liquid on food is easier to titrate to a prescribed dose than a fixed-size capsule.
- A 16 oz bottle lasts long enough for a fair therapeutic trial in a medium dog.
- The maker is explicit that the pet formulation should be used rather than the human one, which is the right advice and is rarely stated so plainly.
Where it falls short
- Fish oil is calorie dense. Adding it to a full bowl without adjusting the ration works against the single most effective thing you can do for an arthritic dog, which is keeping them lean.
- The dose people give is usually far below the level used in the trials that showed a benefit, and the therapeutic dose depends on the dog's weight and health. That makes it a veterinary decision, not a teaspoon-by-eye decision.
- High doses can cause loose stools, can affect platelet function and clotting, and are not appropriate for every dog, including some dogs facing surgery or on certain medications.
- Liquid oil goes rancid once opened. It needs to be kept cool, used within the stated window and thrown out if it smells sharp, and a 16 oz bottle is a lot of oil for a small dog to finish in time.
- It is a supplement, not a treatment. It does not replace pain relief, a diagnosis or weight control.
What owners report
Owner reports for fish oil are dominated by coat and skin changes, which arrive first and are easy to see, and this product gets consistently good marks there. Reports of improved mobility are common but slower and softer, which is what you would expect: the trials that found a benefit in arthritic dogs used therapeutic doses over months, not a splash on dinner for a two weeks.
The recurring practical complaints are the smell, dogs refusing a heavily dosed bowl, and oil going off before a small dog finishes the bottle. Refrigeration after opening and buying a bottle size matched to your dog solves most of that. A minority of owners report loose stools, which is the expected effect of too much too quickly and usually resolves by building the dose up gradually under veterinary guidance.
If you are choosing between supplements, our glucosamine vs fish oil comparison sets out why the evidence favors the oil, and our fish oil vs krill oil comparison covers the other marine option. Our Dasuquin review is worth reading alongside this one, because owners frequently give both without realising how differently the two are supported. And whatever you give, the dose and the suitability belong with your vet, particularly for a dog on medication or heading for surgery.
Who it suits
- Dogs whose vet has recommended omega-3 supplementation as part of an arthritis or skin plan.
- Owners who want the supplement with the best published support in this category rather than the best marketed one.
- Medium and large dogs, who will finish a 16 oz bottle while it is still fresh.
- Dogs who will not take capsules but will eat oil poured on food.
Who should skip it
- Dogs whose dose has not been set by a vet, since guessing is how owners end up with both no benefit and loose stools.
- Dogs with a bleeding disorder, on medication affecting clotting, or scheduled for surgery, until a vet has advised.
- Small dogs, for whom a 16 oz bottle will spoil long before it is finished.
- Owners who will add it on top of the normal ration without adjusting for the calories.
Alternatives worth considering
Nordic Naturals Nordic Naturals Omega-3 Pet Unflavored, Two Pack
~$80
Two 32 oz bottles supplying 1,518 mg of omega-3 per teaspoon, which suits a large dog on a therapeutic dose where a 16 oz bottle would be gone in weeks. Only sensible if the oil will be used before it ages.
Check price on AmazonGrizzly Pet Products Grizzly Salmon Plus Omega 3-6-9 Supplement, 32 oz
~$41
A cheaper salmon oil in a larger bottle, widely used for coat condition. It blends omega 3, 6 and 9 rather than concentrating on EPA and DHA, so it is a poorer choice if the goal is a therapeutic omega-3 dose.
Check price on AmazonNutramax Laboratories Nutramax Dasuquin MSM Soft Chews for Large Dogs, 150ct
~$85
The joint supplement vets name most often, and the one most owners buy first. Read our review before choosing between them, because the evidence for glucosamine and chondroitin in dogs is weaker than the shelf space suggests.
Check price on AmazonKeep reading
- Glucosamine vs fish oil for dogs
- Fish oil vs krill oil for dogs
- Nutramax Dasuquin MSM review
- Best joint supplements for senior dogs
- Senior dog food calculator
This review draws on published specifications, manufacturer figures and the consensus of verified owner reviews. We have not tested this product ourselves, and we say so rather than implying otherwise. As an Amazon Associate we earn from qualifying purchases.
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An Orthopedic Bed for a Stiff Senior Dog
A supportive memory-foam bed is the cheapest change that visibly helps an arthritic dog get up more easily. Waterproof and washable matters more with age.
Frequently Asked Questions
How much fish oil should I give my dog?
Ask your vet, and expect the answer to be based on your dog's weight and the EPA content rather than on a teaspoon guess. This matters more than it does with most supplements, because the doses used in the trials that showed a benefit in arthritic dogs are considerably higher than the amount most owners give, while too much can cause loose stools and affect clotting. Your vet can also tell you whether to build up gradually, which usually avoids the digestive upset.
Is fish oil better than glucosamine for dogs?
On published evidence, marine omega-3 has the better case in canine osteoarthritis, while trials of glucosamine and chondroitin have produced mixed results. That does not mean fish oil is a treatment, and it does not mean a joint chew is worthless. It means that if you are going to spend on one supplement, the oil is easier to defend. Our glucosamine vs fish oil comparison goes through the studies, and our Dasuquin review covers the other side fairly.
Can I give my dog human fish oil?
Nordic Naturals specifically states that its pet products should be used for dogs and cats rather than its human products, and that is the right general caution. Human supplements can contain concentrations, flavorings or additives that do not suit dogs, and some human products include ingredients such as xylitol elsewhere in the range that are dangerous to dogs. Check with your vet before giving a dog anything formulated for people.
Are there side effects of fish oil in dogs?
Yes, and they are worth knowing. Loose stools are the commonest and usually mean the dose went up too fast. High doses can affect platelet function and clotting, which matters before surgery or with certain medications, and can contribute to weight gain because oil is calorie dense. Oxidised or rancid oil is genuinely bad for a dog, so store it as directed and discard it if it smells sharp. Tell your vet about it as you would any medication.
Fish oil or krill oil for a dog?
Both supply EPA and DHA, and the practical differences are concentration, cost and how easily you can hit a therapeutic dose. Fish oil generally makes it easier and cheaper to give a large dog a meaningful amount, while krill oil is usually more expensive per unit of EPA. Our fish oil vs krill oil comparison works through it, and the choice should still be checked with your vet if your dog is on medication.
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