Quick answer: Salmon oil is a source of the long-chain omega-3 fatty acids EPA and DHA. In dogs, the best evidence is for joint comfort in osteoarthritis and as a supporting measure for itchy, allergic skin; DHA also matters for brain and eye development in puppies. It is a supplement, not a treatment: effects build over several weeks, the right amount depends on your dog’s weight and health, and dogs on blood thinners, dogs facing surgery and dogs with a history of pancreatitis should only take it with their vet’s go-ahead.
Salmon oil has become one of the most popular supplements for dogs, and the marketing around it can get a little breathless. This guide sticks to what the research actually shows, where the evidence is thin, and how to use salmon oil safely.
A note on who is writing: this is the Pet Sprint team, and we sell a salmon oil for dogs. We have tried to keep this article useful whether or not you ever buy from us, and we flag our product clearly where we mention it.
What makes salmon oil different: EPA and DHA
Omega-3s come in different forms. Plant oils such as flaxseed provide ALA (alpha-linolenic acid). Fish oils, salmon oil included, provide EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) directly. That difference matters: according to the University of Guelph’s veterinary nutrition team, the body can make some EPA and DHA from ALA, but not enough to see the beneficial effects [1]. That is why marine oils are the usual choice when a vet wants to raise a dog’s EPA and DHA.
| Omega-3 | Main sources | What it is mainly studied for in dogs |
|---|---|---|
| EPA | Fish oils (salmon, menhaden, anchovy) | Inflammation: joints, skin |
| DHA | Fish oils, algal oil | Brain and retina development in puppies |
| ALA | Flaxseed, canola, soybean oils | Limited conversion to EPA/DHA |
The benefits of salmon oil for dogs, and how strong the evidence is
Joint comfort in dogs with osteoarthritis
This is the best-studied use. In a randomized, double-blind trial with 127 client-owned dogs with osteoarthritis, owners of dogs fed a food rich in fish oil omega-3s reported a better ability to rise and play after 6 weeks, and to walk after 12 and 24 weeks, compared with dogs on a control food (Roush et al., 2010). A 2022 systematic review and meta-analysis of nutraceuticals and therapeutic diets for osteoarthritis in dogs and cats concluded that omega-3-enriched diets and omega-3 supplements showed an evident pain-relieving effect (Barbeau-Grégoire et al., 2022).
In practice, omega-3s work best as one part of a joint plan that also includes weight control, regular low-impact exercise and, when needed, pain relief prescribed by your vet. If you are also reading about other joint ingredients, our guide to glucosamine for dogs covers that side.
Skin and coat support
Many owners first notice a softer, shinier coat. For itchy, allergic dogs the evidence is more modest. In a double-blind, placebo-controlled trial of 29 dogs with atopic dermatitis, clinical scores improved in dogs supplemented with an EPA/DHA preparation or with flax oil for 10 weeks, but not in the placebo group (Mueller et al., 2004). Think of salmon oil as a supporting measure for allergic skin, not a replacement for finding the cause of the itch with your vet.
Brain and eye development in puppies
DHA is a building block of the brain and retina. In a study of 48 Beagle puppies, those fed a food fortified with DHA-rich fish oil from weaning to one year scored better on some learning and memory tasks and had higher antibody responses after rabies vaccination than puppies on lower-DHA foods (Zicker et al., 2012). One caveat: the high-DHA food also contained more vitamin E, taurine, choline and L-carnitine, so not every effect can be credited to DHA alone. Most good puppy foods already include DHA; ask your vet before adding more.
Heart health
A review by Tufts veterinary cardiologist Lisa Freeman describes possible benefits of omega-3s in dogs with heart disease, including anti-inflammatory and anti-arrhythmic effects and help with the loss of muscle mass that often comes with heart failure. The same review is clear that more research is needed on the best indications and doses (Freeman, 2010). If your dog has a heart condition, omega-3s are something to discuss with your vet, not to start on your own.
What about immunity, cancer and “making dogs smarter”?
You will see bolder claims online. The honest picture: there are interesting early findings (like the vaccine response in the puppy study above), but there is no good evidence that salmon oil prevents infections, treats cancer, or raises an adult dog’s intelligence. If your dog has cancer, any supplement should be cleared with the oncology team first, because fish oil can interact with some medications.
Side effects and who should be careful
Salmon oil is generally well tolerated at sensible amounts, but it is not risk-free. A review in the Journal of Veterinary Internal Medicine lists the main potential adverse effects of omega-3 supplementation in dogs (Lenox and Bauer, 2013):
- Digestive upset such as loose stools, vomiting or a fishy smell, usually linked to giving too much.
- Effects on platelet function and wound healing, which is why your vet needs to know before any surgery.
- Weight gain, since any oil adds calories.
- Oxidation (rancidity) of the oil, which also increases the need for vitamin E.
- Interactions with some medications.
VCA Animal Hospitals advises using fish oil with caution in dogs with clotting disorders, diabetes or a history of pancreatitis, and notes possible interactions with anticoagulants, NSAIDs such as carprofen or meloxicam, and the chemotherapy drug doxorubicin [8]. On pancreatitis the sources differ: VCA lists it among serious reactions, while the University of Guelph team notes there are no reported cases caused by therapeutic fish oil [1]. If your dog has had pancreatitis, let your vet decide.
How to use salmon oil sensibly
How much salmon oil should you give?
There is no single right dose. It depends on your dog’s weight, the EPA and DHA concentration of the specific product, what is already in the food, and the reason you are using it. Higher amounts used for joints are a decision for your vet, not something to work out from a chart online. For a healthy dog, follow the product label and start at the low end.
Introduce it gradually
Start with a small amount mixed into food and build up over a week or two. This helps avoid loose stools and lets you spot any intolerance early.
Give it time
VCA notes that fish oil may take several weeks before full effects are seen [8]. Judge it after a consistent month or two, ideally with your vet, rather than after a few days.
Store it well
Omega-3s oxidize easily. Close the bottle after each use, keep it away from heat and light, follow the storage instructions on the label, and throw it away if it smells rancid. Because oxidation uses up antioxidants, our article on vitamin E for dogs explains why the two are often discussed together.
Salmon oil is not cod liver oil
Oils made from fish bodies (like salmon oil) are different from cod liver oil, which also carries vitamins A and D. Both vitamins are toxic in excess, so don’t stack liver oils and vitamin products without your vet. More on that in our guide to vitamin D for dogs.
Our salmon oil (yes, this is our product)
Pet Sprint makes a Premium Salmon Oil for dogs: it is 100% salmon oil with natural mixed tocopherols (vitamin E) added to keep it fresh, and it comes with a pump so you can measure each serving. We are obviously biased, so the same advice applies as for any brand: check the label, start low, and talk to your vet if your dog takes medication or has a health condition. Please note that Pet Sprint is an Italian brand and currently ships within the EU only.
If you are comparing options more broadly, our guide Is fish oil good for dogs? covers fish oils in general.
The bottom line
Salmon oil is a useful source of EPA and DHA with reasonable evidence for joint comfort and some support for skin. It is not a cure-all, it needs a few weeks to show results, and it should be used with your vet’s input if your dog has a medical condition, takes medication or is due for surgery.
Frequently asked questions
Is salmon oil good for dogs?
For most healthy dogs, yes, when given at a sensible amount. Salmon oil provides EPA and DHA, the omega-3s with the best evidence in dogs for joint comfort in osteoarthritis and as a supporting measure for skin. It is a supplement, not a treatment, and dogs with medical conditions should use it with their vet’s advice.
How long does it take for salmon oil to work in dogs?
Usually several weeks. VCA Animal Hospitals notes that fish oil may take several weeks before full effects are seen, and joint trials in dogs measured changes after 6 to 12 weeks and longer. Give it a consistent month or two before deciding.
Can I give my dog salmon oil every day?
Yes, daily use is the normal way to give it, at the amount on the label or the amount your vet recommends. Too much can cause loose stools and adds calories, so do not increase the dose on your own.
What are the side effects of salmon oil for dogs?
The most common are digestive: loose stools, vomiting or fishy breath, usually from giving too much. Omega-3s can also affect platelet function and wound healing, cause weight gain and interact with some medications such as anticoagulants and NSAIDs. Tell your vet before surgery or if your dog has had pancreatitis.
Is salmon oil better than fish oil for dogs?
Salmon oil is a type of fish oil. What matters most is how much EPA and DHA the product provides, its freshness and its quality, not the fish species alone. Cod liver oil is different, because it also contains vitamins A and D.
Can puppies have salmon oil?
DHA is important for puppy brain and eye development, but most complete puppy foods already contain it. Ask your vet before adding salmon oil to a puppy’s diet, so the total amount stays appropriate.
Sources
- Iaboni J (reviewed by Verbrugghe A, Abood SK et al.). “The ABCs of omega-3s.” University of Guelph, Ontario Veterinary College Pet Nutrition, 2024. ovcpetnutrition.uoguelph.ca
- Roush JK et al. (2010). “Multicenter veterinary practice assessment of the effects of omega-3 fatty acids on osteoarthritis in dogs.” Journal of the American Veterinary Medical Association, 236(1):59-66. PubMed 20043800
- Barbeau-Grégoire M et al. (2022). “A 2022 systematic review and meta-analysis of enriched therapeutic diets and nutraceuticals in canine and feline osteoarthritis.” International Journal of Molecular Sciences, 23(18):10384. PubMed 36142319
- Mueller RS et al. (2004). “Effect of omega-3 fatty acids on canine atopic dermatitis.” Journal of Small Animal Practice, 45(6):293-297. PubMed 15206474
- Zicker SC et al. (2012). “Evaluation of cognitive learning, memory, psychomotor, immunologic, and retinal functions in healthy puppies fed foods fortified with docosahexaenoic acid-rich fish oil from 8 to 52 weeks of age.” Journal of the American Veterinary Medical Association, 241(5):583-594. PubMed 22916855
- Freeman LM (2010). “Beneficial effects of omega-3 fatty acids in cardiovascular disease.” Journal of Small Animal Practice, 51(9):462-470. PubMed 20673293
- Lenox CE, Bauer JE (2013). “Potential adverse effects of omega-3 fatty acids in dogs and cats.” Journal of Veterinary Internal Medicine, 27(2):217-226. PubMed 23323770
- Hyland K, Gollakner R. “Fish Oil.” VCA Animal Hospitals, last updated January 2026. vcahospitals.com
- Benefits of Salmon Oil for Dogs: Why Salmon Oil is Good for Dogs - July 17, 2024
