If you’ve ever stood in the pet aisle wondering whether a bottle of fish oil is worth it, you’re not alone. Salmon oil is one of the most popular supplements UK dog owners add to the bowl, and for good reason: it’s a rich, natural source of the omega 3 fatty acids that dogs can’t make well on their own. In this guide we explain the real benefits of salmon oil for dogs, what the evidence does and doesn’t say, and how to add it safely to your dog’s diet.
Key takeaways
- Is salmon oil good for dogs? For most healthy dogs, yes. It provides EPA and DHA, two omega 3 fatty acids with natural anti inflammatory properties.
- The best-supported benefits are for skin health, coat condition and joint health, with growing evidence for heart, brain and eye health.
- Results build slowly. Vets say it can take several weeks before you see the full effect.
- More isn’t better. Follow the feeding guide, start gradually, and speak to your vet if your dog has a health condition or takes medication.
What is salmon oil for dogs?
Salmon oil is the natural oil pressed from salmon, a cold water fish. Like other oily fish, salmon is packed with essential fatty acids, especially two long-chain omega 3s:
- EPA (eicosapentaenoic acid), best known for its role in calming inflammation in the skin and joints.
- DHA (docosahexaenoic acid), a building block of the brain and eyes, important for healthy brain development in puppies.
Salmon oil also contains smaller amounts of omega 6 and omega 9. That’s why you’ll often see “Omega 3, 6 & 9” on the label, including on our PawDoctor Scottish Salmon Oil.
Not all fish oil products are made the same way. Many high quality fish oils, including pure salmon oil, are a natural triglyceride oil, which is the form the fats naturally take in the fish. Some concentrated supplements are processed into a synthetic triglyceride oil or ethyl ester form to pack in more EPA and DHA per capsule. Both can work, but a single-ingredient natural oil is simple, easy to pump onto food, and something most dogs find tasty.
Is salmon oil good for dogs?
For most healthy dogs, salmon oil is a safe and useful addition to a balanced diet. Omega 3 fatty acids are one of the most widely used supplements in veterinary practice. The VCA Animal Hospitals vet team lists skin allergies, arthritis, kidney disease, heart disease and inflammatory bowel disease among the conditions vets use fish oil to support.
It’s worth being honest about the other side, too. If your dog already eats a complete and balanced diet, they’re getting the essential nutrients they need to survive. Some vets and nutritionists point out that salmon oil isn’t a magic fix, and that the extra calories count. Salmon oil is best thought of as a top-up: a way to raise omega 3 levels for skin, coat, joints and overall health beyond what many commercial dog food recipes contain.
“Recommended doses of EPA and DHA supplements for therapeutic purposes range from 50 to 220 mg/kg body weight.”
In other words, the amount matters. A few drops won’t do much, and a heavy hand can cause tummy trouble. We cover exact amounts in our guide to how much salmon oil to give your dog.
7 benefits of salmon oil for dogs
1. Healthier skin and less itchy skin
This is the number one reason dog owners start giving salmon oil. EPA helps regulate the inflammatory response in the skin, and omega 3s help support a strong skin barrier that holds in moisture. Dogs with dry skin, flaky skin, sensitive skin or seasonal itchy skin are the ones owners most often say benefit. Vets frequently recommend omega 3s alongside other treatment for allergic skin disease such as atopic dermatitis.
If your dog’s skin is red, broken, smelly or they’re scratching constantly, see your vet first. Salmon oil can support skin health, but it isn’t a treatment for infections, fleas or mites.
2. A shinier coat and better coat condition
A dull coat is often one of the first signs that a dog’s skin could use some support. Because the coat grows from the skin, improving skin health tends to show up as better coat quality: a softer, glossier, shiny coat with less dandruff. Many owners notice this before any other change, usually after one to two coat growth cycles.
3. Joint health and mobility, especially for senior dogs
Joint support has some of the strongest evidence behind it. Omega 3s help reduce inflammation in the joints, and diets enriched with EPA and DHA are used by vets for dogs with osteoarthritis. For senior dogs with joint stiffness or joint pain, salmon oil can be a helpful part of a wider plan that includes weight control, sensible exercise and any treatment your vet prescribes. It won’t rebuild cartilage, but it can support comfortable movement.
4. Heart and cardiovascular health
Omega 3 fatty acids help support cardiovascular health and healthy blood flow. Vets use fish oil as part of the management of some types of heart disease in dogs. For a healthy dog it’s a supportive, not a curative, nutrient. If your dog has a heart condition, ask your vet before adding anything new.
5. Brain health, cognitive function and eye health
DHA is concentrated in the brain and retina. It supports healthy brain development in puppies, which is why it’s added to many puppy foods, and it may help support cognitive function in older dogs. Eye health is another area where DHA plays a structural role.
6. Immune system support
Omega 3s influence how the immune system responds, helping to keep inflammation in balance. A well-supported immune function is one more reason salmon oil is popular as a daily all-rounder for your dog’s health.
7. A tasty food topper fussy eaters love
It sounds simple, but it matters. Most dogs love the taste of salmon oil, so adding salmon oil to dry food or wet food can encourage fussy eaters and turn the bowl into something they look forward to.
Salmon oil vs other fish oil supplements
Salmon oil is one of several omega sources. Here’s how the most common dog fish oil products and alternatives compare.
| Option | Omega 3 (EPA & DHA) | Good for | Watch out for |
|---|---|---|---|
| Salmon oil | Rich natural source | Skin, coat, joints; tasty food topper | Calories; choose a reputable source |
| Generic fish oil (anchovy, sardine) | Varies by product | Similar benefits; often in capsules | Quality and freshness vary |
| Cod liver oil | Moderate | Occasional use | High vitamins A and D. Easy to overdo |
| Krill oil | Moderate | Small doses | Expensive per dose |
| Algae oil | Mainly DHA | Fish-free option | Lower EPA; pricier |
| Vegetable oils (e.g. coconut, sunflower) | None | Calories, omega 6 | No EPA or DHA, high in saturated fats (coconut) |
So is fish oil good for dogs in general? Yes, but salmon oil stands out because it’s naturally rich, single-ingredient and palatable. Avoid giving your dog human supplements unless your vet suggests it. Some contain flavourings, added vitamins or capsule sizes that make dosing tricky.
How long does salmon oil take to work?
“This medication may take several weeks before full effects are seen.”
Omega 3s are taken up into the cell membranes of the skin and joints gradually, so consistency matters more than quantity. Here’s a realistic timeline:
- Days 1–5: introduce slowly, building up to the full amount.
- Weeks 2–4: many dogs show a softer coat and less flaky skin.
- Weeks 4–8: owners often notice less scratching.
- Months 2–3: fuller, glossier coat; joint support builds over this period.
Every dog is different and results vary. If nothing has changed after three months, speak to your vet about other causes.
How to add salmon oil to your dog’s diet
Giving salmon oil couldn’t be easier: pump it straight onto your dog’s food once a day and stir it through. It works with dry kibble, wet food, raw or home-cooked meals.
- Start low: introduce it gradually over five days to avoid an upset tummy.
- Dose by your dog’s body weight: follow the feeding guide on the bottle.
- Be consistent: salmon oil works best as a daily habit. A Subscribe & Save plan means you never run out.
As a guide, PawDoctor Scottish Salmon Oil recommends 1–2 pumps (2–4 ml) a day for dogs up to 10 kg, rising to 5–7 pumps for dogs over 45 kg. See the full table in our salmon oil dosage guide.
Side effects of too much salmon oil, and who should check with a vet
Salmon oil is generally well tolerated, but too much salmon oil can cause loose stools, vomiting, fishy breath, an oily coat and weight gain from the extra calories (around 40 calories in a 5 ml teaspoon). Vets also advise caution for dogs:
- with a history of pancreatitis or a very sensitive stomach
- on blood thinners, NSAID pain relief or other medication
- with a clotting disorder, or due to have surgery
- who are pregnant, nursing, diabetic or overweight
If you notice diarrhoea, vomiting, unusual bruising or bleeding, stop and call your vet.
How to choose a good salmon oil supplement
- Single ingredient: look for 100% salmon oil with nothing added.
- Traceable source: Scottish or Norwegian salmon from a named supplier.
- Freshness: oils can oxidise. Choose a sealed pump bottle, keep it somewhere cool and dark, and use it within the time on the label.
- Clear dosing: a pump and a feeding guide by weight make it easy to get right.
Our Scottish Salmon Oil is one pure ingredient in a 1 litre pump bottle with a feeding guide by weight. It's made in the UK and suitable for dogs, puppies and cats. Browse the full supplements range, or read our guide to salmon oil for cats if you share your home with a feline too.
Frequently asked questions
Can I give my dog salmon oil every day?
Yes. Salmon oil is designed to be given every day at the amount on the feeding guide. Daily use is what builds up omega 3 levels over time.
Do vets recommend salmon oil?
Many vets recommend omega 3 supplements, including salmon oil, for skin, coat and joint support. Always ask your own vet if your dog has a medical condition or takes medication.
Does salmon oil actually work for dogs?
For skin, coat and joints there’s good evidence that EPA and DHA help, but results depend on the amount, the quality of the oil and giving it consistently for several weeks.
What is the best oil for dogs’ joints?
Oils rich in EPA and DHA, such as salmon oil and other fish oils, have the strongest evidence for joint health. Vegetable and coconut oils don’t contain EPA or DHA.
Which is better for dogs, coconut oil or salmon oil?
Salmon oil. Coconut oil is mostly saturated fat and contains no omega 3s, whereas salmon oil provides EPA and DHA.
Is salmon oil good for puppies?
Yes, DHA supports healthy brain and eye development. Introduce it gradually and dose by weight as your puppy grows.
Sources
- Raditic D, Gaylord L. Fish Oil Dosing in Pet Diets and Supplements. Today’s Veterinary Practice, 2020.
- Hyland K, Gollakner R. Fish Oil. VCA Animal Hospitals.
- Eldredge D. Is Salmon Oil Good for Dogs? Whole Dog Journal, 2023.
