Salmon oil for dogs: benefits, dosage, and what to look for

Salmon oil is the omega-3 supplement most UK vets recommend. The reason: it's well-researched, well-tolerated, and genuinely effective for skin, coat, and joint support. But not every salmon oil is the same.

What's actually in salmon oil

The active ingredients are EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), two long-chain omega-3 fatty acids. Salmon oil contains both naturally, in higher concentrations than flaxseed oil (which is mostly ALA, a shorter-chain omega-3 that dogs convert poorly to EPA/DHA).

What it actually does

  • Supports skin barrier function. EPA and DHA are incorporated into skin cell membranes; adequate levels support a healthier barrier.
  • Helps maintain a balanced inflammatory response. Without dropping into medical-claim territory: omega-3s shift the balance of inflammatory mediators.
  • Supports coat condition. Most owners notice a softer, glossier coat within 4-6 weeks of consistent supplementation.
  • Joint support. Same omega-3 mechanism that helps skin also helps joint comfort in older dogs.

How much

The general guideline used by UK vets: roughly 50-100mg combined EPA + DHA per kg of bodyweight per day. So a 20kg dog needs around 1-2g of EPA + DHA daily. That translates to a teaspoon to tablespoon of typical liquid salmon oil, or whatever the label dose says for chews.

Critically: don't go on "salmon oil mg," go on "EPA + DHA mg." A 1000mg salmon oil capsule might only contain 180mg of EPA + DHA. Higher-quality oils declare both.

What to look for on the label

  1. Stated EPA + DHA per dose. If it just says "salmon oil mg," walk away.
  2. Sourced from cold-water salmon with traceable supply chains. Atlantic and Pacific are both fine; farmed vs wild is less important than the EPA/DHA levels.
  3. Antioxidants added (vitamin E typically) to prevent the oil oxidising.
  4. Stored cool, used within 60 days of opening for liquid forms. Chews are more stable.
  5. UK or EU manufactured with food-grade standards (not just "fish oil for industrial use").

Liquid vs chews

  • Liquid: usually higher concentration per dose, smelly, refrigerate after opening, dose by weight on the bottle. Some dogs hate the smell.
  • Chews: dose-controlled, no refrigeration, dogs eat them like a treat, usually paired with other ingredients. Easier to stay consistent with.

The right answer depends on your dog and your routine. Whichever you can stick with consistently for 4-6 weeks is the right one for you.

The MBF approach

Our Itch Relief Chews use salmon oil as one of eight ingredients, paired with flaxseed oil, probiotics, turmeric, vitamin C, and skin-supporting compounds. The total stack is a complementary feed, not just a salmon oil chew, designed for daily skin and coat support.

If you want salmon oil alone, plenty of UK brands do solid liquid options. If you want a multi-ingredient daily chew that includes salmon oil, we made one.

Always consult your vet for ongoing skin conditions.

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