Pet supplements / best of
Best fish oil for dogs.
Dog omega-3 fish-oil supplements, ranked on our rubric. Omega-3 has the strongest evidence of any supplement we score, so the question is whether a product discloses a real EPA and DHA dose.
Omega-3 fish oil is the rare pet supplement where the science is on the buyer's side. EPA and DHA, the two long-chain omega-3s concentrated in fish oil, have real peer-reviewed evidence in dogs for easing joint discomfort and improving skin and coat, which is why our Evidence sub-score rates omega-3 above glucosamine, green-lipped mussel, and most probiotics. The catch is that a strong active does not make a strong product.
Three things decide whether a fish oil earns its evidence. First, disclosure: a label should state EPA and DHA as separate milligram amounts, not bury them inside a single 'total omega-3' or 'fish oil' figure, because the combined EPA-plus-DHA dose is the number that matters. Second, dose: joint and skin studies generally use somewhere around 50 to 75 milligrams of combined EPA and DHA per kilogram of body weight per day, and many products' weight-based directions fall short of that for a smaller dog. Third, form: the triglyceride form of fish oil absorbs better than the cheaper ethyl-ester form.
This list ranks the dog fish oils in our catalog by full composite, so a well-disclosed, well-dosed oil rises and a vague salmon oil with a hidden dose falls. Pump-bottle oils that never state how many servings are in the bottle are not here, because we cannot verify their cost per day. Read each scorecard for the actual EPA and DHA numbers.
7 supplements
Ranked by PetScored composite.
- Nordic Naturals Omega-3 Pet Soft Gels
The strongest-evidence omega active, fully disclosed in triglyceride form and third-party tested; a partial per-softgel dose for a larger dog keeps it just under the top.
Dogs & catsSkin & coatNASC seal8.8Strong - Zesty Paws Wild Alaskan Salmon Oil
A disclosed, well-dosed salmon and pollock omega oil, NASC-sealed and inexpensive per day; strong execution puts it near the top. The Feb 2025 Zesty Paws recall covered soft chews, not this oil.
Dogs & catsSkin & coatNASC seal8.5Strong - Grizzly Salmon Plus Wild Salmon Oil
High disclosed EPA and DHA per pump in natural triglyceride form, NASC-audited, and inexpensive per day; strong execution lands it at the top of Good.
Dogs & catsSkin & coatNASC seal8.4Good - Vetoquinol Triglyceride OMEGA (Medium Dog)
A fish-oil softgel that discloses EPA and DHA separately in the more bioavailable triglyceride form, NASC-sealed and fairly priced, keyed to the skin and coat claim; the omega evidence for skin sits a notch below the joint tier and the per-softgel dose is moderate, so clean execution lands it Good.
DogsSkin & coatNASC seal7.7Good - Nutramax Welactin Canine Omega-3 Softgels
A disclosed, well-made omega-3 keyed to the skin and coat claim (a notch below the joint evidence tier); solid execution and value land it Good.
DogsSkin & coat7.6Good - VetriScience Omega 3,6,9 Gel Caps
Discloses EPA and DHA separately in an NASC gel cap from a maker that owns its cGMP plant, but the weight-scaled label dose delivers only about 20 mg/kg/day of EPA plus DHA, below the studied skin and coat range, and there is no independent testing.
Dogs & catsSkin & coatNASC seal7.5Good - Coromega Pup Packets Condition (Skin & Immune)
An emulsified fish-oil packet that discloses EPA and DHA separately and reaches a borderline-adequate skin and coat dose at one packet, at a fair price; but its NASC claim is not in the current directory so we do not credit it, and there is no independent testing.
DogsSkin & coat7.0Mixed
FAQ
Frequently asked
Does fish oil actually work for dogs?
It has better evidence than most pet supplements. Combined EPA and DHA, the omega-3s in fish oil, have peer-reviewed support in dogs for joint comfort and for skin and coat health, which is why our rubric scores omega-3 as the strongest-evidenced active in the category. The benefit depends on reaching an adequate dose.
How much fish oil should a dog get?
Studies generally use roughly 50 to 75 milligrams of combined EPA plus DHA per kilogram of body weight per day. The number that matters is EPA plus DHA, not 'total fish oil', so check that the label discloses both. Confirm a specific dose with your veterinarian.
What is the best form of fish oil for dogs?
The triglyceride form absorbs better than the cheaper ethyl-ester form. More important than form, though, is that the label discloses a real EPA and DHA dose; an excellent form at a hidden or low dose still does not tell you what your dog gets.
This ranking is our opinion under a published rubric, not veterinary advice. Affiliate links on individual scorecards never affect the score. See the affiliate disclosure and medical disclaimer.