Salmon Oil for Dogs: Benefits and What to Look For

Written by Lucy Fitzgerald, Founder, WYLDR. Reviewed by Katie McCaul, RNutr, The Pet Diet. Updated 29 June 2026.

The short answer: Salmon oil is a marine source of the omega-3 fats EPA and DHA, which most everyday dog diets are short on. Fed in sensible amounts, it is a popular nutritional top-up that supports normal everyday body function, from cell membranes to skin and coat. It is a food, not a treatment, so see your vet for any specific health concern.

Salmon oil for dogs is one of the most popular additions an owner can make to the bowl, and unlike a lot of pet trends, the interest in it is well founded. The reason comes down to a particular type of fat that most everyday diets are short on. This guide explains what salmon oil actually is, what the omega-3 inside it does in plain, honest terms, why even good diets tend to under-deliver it, how to give it, and how to tell a quality salmon oil from a poor one. No hype, just what is worth knowing before you add it to your dog's routine.

What salmon oil is

In short: Salmon oil is an oil extracted from salmon, valued not for calories but for its high content of long-chain omega-3 fatty acids, the good fats the body cannot make efficiently on its own.

Salmon oil is exactly what it sounds like: an oil extracted from salmon, a cold-water oily fish. It is prized not for calories but for its fatty acid profile, specifically its content of long-chain omega-3 fatty acids. These are the "good fats" that the body uses but cannot make efficiently on its own, which is why they need to come from the diet.

It is worth being clear about the difference between salmon oil and a couple of things it is often confused with. Salmon oil is not the same as salmon flesh, which is a protein food. It is also slightly different from generic "fish oil", which can be blended from various fish. Salmon oil is a recognisable, single-source oil, and quality varies a great deal between products, which is the part most buyers overlook.

What EPA and DHA are

In short: EPA and DHA are the two long-chain omega-3 fats found in oily fish, and they are the ones that matter most in a dog's diet. The plant omega-3 (ALA) converts into them only inefficiently.

When people talk about omega-3 for dogs, they are usually talking about two specific fatty acids: EPA and DHA. EPA stands for eicosapentaenoic acid, and DHA stands for docosahexaenoic acid. They are the two long-chain omega-3s found in oily fish, and they are the ones that matter most in canine nutrition.

This is an important distinction, because not all omega-3 is equal. There is another omega-3 called ALA, found in plant sources such as flaxseed. Dogs can convert a little ALA into EPA and DHA, but research in canine nutrition consistently finds this conversion is inefficient, so the most reliable way to provide these fats is directly, from a marine source such as salmon oil. When a label simply says "omega-3" without naming EPA and DHA, it is worth asking which type it actually contains.

What omega-3 does in the body

In short: EPA and DHA are structural fats built into every cell membrane. EPA helps shift the body's balance toward less inflammatory signalling, and DHA is a building block of the brain and eyes, which is why it is important for growing puppies.

Here is where honesty matters, because omega-3 is an area where pet marketing tends to over-promise. So let us keep to what the science actually supports.

EPA and DHA are structural and functional fats. They are built into the membranes of cells throughout the body, where they influence membrane fluidity, the way cells communicate, and processes such as hair-follicle function (Calder, 2017). DHA in particular is a building block of nervous tissue and the retina, so it contributes to normal brain and eye development, which is why it is considered important, even essential, for growing puppies.

EPA has a second, well-studied role: it competes with the omega-6 fatty acid arachidonic acid in the body, which shifts the balance of signalling molecules the body produces toward those that are less inflammatory (Calder, 2010). This is general nutrition science about the fatty acid itself, not a claim that salmon oil treats a condition.

What salmon oil is not is a treatment. It is a nutritional source of specific fats, fed to help maintain normal function, not to fix a problem or guarantee a particular result. If your dog has a skin condition, a dull coat that concerns you, or any health issue, that is a conversation for your vet rather than something to self-manage with an oil. Treat salmon oil as a sensible nutritional top-up, not a remedy.

Why most diets under-deliver omega-3

In short: Three reasons. High heat reduces the fragile omega-3 in kibble, muscle-heavy raw diets are skewed toward omega-6, and the adult feeding standards do not require EPA and DHA at all. So most ways of feeding fall short.

If omega-3 matters and salmon oil provides it, a fair question is why it is not already covered by a complete dog food. There are three honest reasons.

The first is heat. EPA and DHA are fragile fats. They are sensitive to high temperatures and they degrade with exposure to air over time. Most dry dog food is made by extrusion, a high-heat process, and that heat is hard on these particular fats. So even a kibble that lists fish or fish oil on the label can deliver less active omega-3 by the time it has been cooked, bagged and stored than the ingredient list might suggest. This is not a reason to think less of kibble. It is simply what high heat does to a heat-sensitive nutrient, and it is why adding omega-3 back in a gentler form is a sensible idea.

The second reason applies to raw and fresh feeding. Raw diets are often built around muscle meat, which is naturally higher in omega-6 than omega-3. Without oily fish or a marine oil deliberately added, a raw-fed dog can be just as short on EPA and DHA as a kibble-fed one, because the balance between omega-6 and omega-3 is skewed.

The third reason is the standard itself. The FEDIAF nutritional guidelines do not require EPA and DHA to be added to food for adult dogs. So a food can be perfectly "complete" for an adult and still contain very little of these particular fats. For a nutrient this useful, that is exactly the kind of gap a daily top-up is well placed to fill. Whichever way you feed, omega-3 is one of the nutrients most likely to fall short, which is a big part of why salmon oil is so widely used.

How much salmon oil to give a dog, and how

In short: It depends on your dog's size, the product's concentration and how much is already in their diet, so follow the label and introduce it gradually. Add it to food, store it sealed and cool, and check with your vet if your dog is on medication.

The honest answer to "how much" is that it depends on your dog's size, the concentration of the specific product, and how much omega-3 is already in their current diet, because salmon oils vary in how much EPA and DHA they actually contain. For that reason, the right move is to follow the feeding guidance on the product you choose rather than work from a generic figure, and to introduce it gradually over several days so your dog's system can adjust. If your dog is on a controlled diet for a health reason, or is on medication, check with your vet before adding an oil.

Giving it is simple. Salmon oil is usually added straight onto food and mixed through, and most dogs take to the taste readily. One practical point worth knowing is storage. Because these fats oxidise when exposed to air, light and warmth, a liquid oil can turn rancid once opened if it is not kept cool, sealed and used within a sensible window. Rancid oil is the opposite of what you want, so storage is part of getting the benefit, not an afterthought.

What to look for in a quality salmon oil

In short: Choose a product that is open about its EPA and DHA content, is protected from oxidation and kept fresh, and comes from a clean, recognisable, ideally sustainable source.

This is where the real differences between products show up, and where a little knowledge saves money and disappointment.

First, look at the omega-3 itself. A good product is open about its EPA and DHA content rather than hiding behind a vague "rich in omega-3". If you cannot tell how much of the active fats are in there, you cannot judge value.

Second, consider freshness and how the oil is protected from oxidation. As covered above, these fats degrade with air, light and heat, so how an oil is processed, packaged and stored matters as much as where it came from. Products that are made and held with this fragility in mind hold on to more of what makes them worth buying.

Third, look for a clean, honest product with a recognisable source and nothing unnecessary added. Sustainability of the salmon source is a fair thing to consider too, and reputable brands tend to be transparent about it. One nuance worth knowing: some salmon oils are microdistilled to purify them, which can produce a cleaner oil but can also strip out some naturally present nutrients, such as Vitamins A and D.

This thinking is behind how WYLDR uses salmon oil. It is one of the four named ingredients in Every Dog Every Day, included as a source of the omega-3 fats that everyday diets tend to lose or under-deliver. It is used in a freeze-dried form rather than as a liquid: freeze-drying removes moisture at low temperature, and the oil is held within the dried piece rather than pooled in an opened bottle, which helps protect these fragile fats from the oxidation that turns a liquid oil rancid. In keeping with our own rules, that is a description of the ingredient and the format, not a promise of a particular result for your dog. The salmon oil is there to add back one of the things a normal bowl is most likely to miss, alongside prebiotic fibre and antioxidants, which is the whole "we add what's missing" idea.

If you want the bigger picture of where omega-3 fits among the other nutrients a diet can run short on, our guide to whether dogs need supplements walks through the common gaps.

Is salmon oil safe for dogs?

In short: For most healthy dogs, salmon oil is well tolerated in sensible amounts. Too much can loosen stools, add calories, or build up fat-soluble vitamins, and rancid oil is worth avoiding. Dogs on medication or with health conditions should start only after a word with the vet.

For most healthy dogs, salmon oil is well tolerated when it is given in sensible amounts. The two things to keep an eye on are quantity and freshness. Too much oil at once can loosen the stools or simply add calories the dog does not need, so the recommended amount is the right amount rather than a generous pour. It is also worth being aware of the fat-soluble vitamins: a diet already high in fish, topped with salmon oil, can push the intake of Vitamins A and D toward the upper safe limit, so more is not automatically better. As covered above, oil that has gone rancid is worth avoiding, so it makes sense to buy a quantity you will get through in a reasonable time and to store it well.

There are a few situations that call for more care. Dogs with certain health conditions, dogs that are overweight, and dogs on medication should only start salmon oil after a word with the vet, because added fats can be relevant to some conditions and treatments. As with anything new, introduce it slowly over a few days and watch how your dog responds.

How salmon oil compares with other omega-3 sources

In short: Other marine oils such as fish or krill oil also provide EPA and DHA; what matters is the actual content and freshness, not the name. Plant sources like flaxseed give ALA, which dogs convert inefficiently, so they are a weaker route.

Salmon oil is not the only way to provide omega-3 for dogs, and it helps to understand how the options differ. Other marine oils, such as generic fish oil blends or krill oil, also supply EPA and DHA, and the meaningful comparison between them is the actual EPA and DHA content and the freshness of the oil, rather than the name on the bottle. Plant sources such as flaxseed provide ALA, the short-chain omega-3 that dogs convert only inefficiently into EPA and DHA, and studies comparing omega-3 sources in dogs have found marine oils raise blood omega-3 levels far more effectively than flaxseed, so plant sources are a weaker route to the fats that matter most.

This is why, when people search for the best fish oil for dogs, the honest answer is less about a single winning product and more about choosing a clean, clearly labelled marine oil with a known EPA and DHA content that has been kept fresh. A well-made salmon oil for dogs meets those criteria and has the advantage of coming from a single, recognisable source.

Frequently asked questions

Is salmon oil good for dogs?
Salmon oil is a recognised source of the long-chain omega-3 fats EPA and DHA, which most everyday diets under-deliver. Fed sensibly as a nutritional top-up, it is a popular and reasonable addition. It is a food source, not a treatment, so if your dog has a specific health concern, speak to your vet.

What does salmon oil do for dogs?
It provides EPA and DHA, omega-3 fats that are built into cell membranes throughout the body and support normal everyday function. EPA helps shift the body's balance toward less inflammatory signalling, and DHA contributes to normal brain and eye development, while omega-3 generally is associated with maintaining normal skin and coat. It supports normal nutrition rather than treating any condition.

How much salmon oil should I give my dog?
It depends on your dog's size, the concentration of the product, and what is already in their diet and other supplements, so follow the guidance on the specific salmon oil you use and introduce it gradually. Check with your vet if your dog is on medication or a controlled diet.

Can I give my dog salmon oil every day?
Yes, and consistency is the point. Omega-3 builds up in the body gradually: studies measuring the omega-3 index in dogs, the level of EPA and DHA in their red blood cells, suggest it takes around 12 to 16 weeks of regular feeding to reach a steady level. So salmon oil is a daily habit rather than a quick fix. Stick to the recommended amount rather than assuming more is better, and store it properly so it stays fresh.

Is salmon oil or fish oil better for dogs?
Both can be good sources of omega-3. The more useful question is how much EPA and DHA a product actually contains and how fresh it is, rather than the name on the bottle. A clearly labelled, well-made salmon oil is a sound choice.

Can puppies have salmon oil?
DHA contributes to normal brain and eye development, which is why omega-3 is considered important for growing dogs. Amounts for puppies differ, so follow product guidance for the life stage and check with your vet if you are unsure.

Sources

• Calder, P.C. (2017) "Omega-3 fatty acids and inflammatory processes: from molecules to man", Biochemical Society Transactions: link
• Calder, P.C. (2010) "Omega-3 fatty acids and inflammatory processes", Nutrients: link
• Fu, Y. et al. (2021) "Dietary Omega-3 PUFAs, the Gut Microbiota, and Intestinal Immunity", Mediators of Inflammation: link
• Today's Veterinary Practice, "Role of Dietary Fatty Acids in Dogs and Cats": link
• "Enhanced omega-3 index after long- versus short-chain omega-3 supplementation in dogs" (PMC): link
• "The Effects of Omega-3 Supplementation on the Omega-3 Index in Dogs" (16-week study): link
• "Comparison of Fish, Krill and Flaxseed as Omega-3 Sources in Dogs" (PMC): link
• "The balance of n-6 and n-3 fatty acids in canine, feline, and equine nutrition" (PMC): link
• FEDIAF, Nutritional Guidelines for Complete and Complementary Pet Food: link