Salmon Oil or Fish Oil for Dogs. What is the Difference?

June 16, 2026

Veterinarian Approved

Reviewed and approved by Dr. Amber Da Silva, DVM

This article has been reviewed by a veterinarian for accuracy and current pet health guidelines.

Both salmon oil and fish oil provide omega-3 fatty acids, specifically EPA and DHA, that dogs cannot produce on their own. These nutrients support a healthy skin and coat, joint function, heart function, and a healthy immune system. The key difference between the two comes down to source and form.

Salmon oil comes specifically from salmon, while fish oil is a broader term that can include sardine, cod, krill, or other fish sources, with more variability in quality depending on sourcing and processing.

Key Takeaways

Dogs need omega-3 fatty acids from an external source because their bodies cannot make them
Both fish oil and salmon oil provide EPA and DHA
Benefits include support for healthy skin and coat, joint function, heart function, and a healthy immune system
The general feeding guideline is 75 to 100 mg of combined EPA and DHA per kilogram of body weight daily
Triglyceride-form oil is more bioavailable than ethyl ester

What Is Fish Oil for Dogs?

Fish oil is a dietary supplement made from the fatty tissue of fish. It is one of the most well-researched supplements for dogs because it delivers omega-3 fatty acids, specifically EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), that play a role in nearly every system in your dog's body.

Dogs and cats cannot produce omega-3s on their own. Many commercial dog foods are higher in omega-6 fatty acids, and fish oil supplements help provide a more balanced fatty acid intake.

Fish oil can come from many sources, including sardines, anchovies, cod, krill, or salmon. Quality varies depending on the source and how it is processed.

What Is Salmon Oil and How Is It Different?

Salmon oil is a specific type of fish oil made exclusively from salmon. Quality salmon oil generally offers:

A concentrated source of omega-3 fatty acids
Triglyceride form, which retains the oil's natural structure and is generally absorbed more efficiently than ethyl ester form
Sustainable sourcing, so look for products with third-party sourcing verification

Vital Pet Life Salmon Oil is sustainably sourced, in triglyceride form, and verified by Orivo's NMR lab testing for species and geographic origin, so you know exactly what is in the bottle.

Health Benefits of Salmon Oil and Fish Oil for Dogs

Healthy Skin and Coat

Omega-3 fatty acids support skin comfort and a healthy, shiny coat. Many dogs show a noticeable improvement in coat quality within a few weeks of consistent use.

Joint Function

Omega-3 fatty acids may help support normal joint function, which can be especially helpful for active or aging dogs.

Heart Function

Omega-3 fatty acids EPA and DHA help support heart function.

Immune System Support

Omega-3 fatty acids provide nutrients that support a healthy immune system.

How Much Salmon Oil or Fish Oil Should You Give Your Dog?

The general guideline is 75 to 100 mg of combined EPA and DHA per kilogram of body weight per day. Most salmon oil and fish oil products include a feeding chart on the label based on your dog's weight.

A few tips:

Start with a smaller amount and increase gradually over 1 to 2 weeks to avoid digestive upset
Drizzle over your dog's regular food, since most dogs love the taste
Store in a cool, dark place and refrigerate after opening to prevent oxidation
Consult your vet if your dog is on medication, especially blood thinners, as omega-3s may affect normal clotting processes

How to Choose a Quality Salmon Oil or Fish Oil for Your Dog

Not all salmon oils and fish oils are equal. When shopping, look for:

Sustainably sourced, with documentation available on request
Triglyceride form for better absorption than ethyl ester
Third-party testing for species and origin verification
No additives or preservatives

👉 Shop Vital Pet Life Salmon Oil

Frequently Asked Questions

Is salmon oil better than regular fish oil for dogs?

Both can be good choices for dogs. Salmon oil is a single-source oil, while fish oil can come from a broader range of fish. Salmon oil often comes in triglyceride form, which tends to be more bioavailable, meaning your dog's body may absorb and use it more efficiently. The right choice depends on your dog's needs and your vet's recommendation.

Can I give my dog human fish oil capsules?

You can, but it is not ideal. Human fish oil capsules are often in ethyl ester form and may contain additives. A fish oil supplement formulated specifically for pets will be better suited to their size and needs. Always check the label for the feeding amount.

How long does it take to see results from salmon oil?

Most pet owners notice improvements in skin and coat within 4 to 8 weeks of consistent daily use. Joint and immune support benefits may take a little longer to become noticeable.

Is salmon oil safe for cats too?

Yes. Cats also cannot produce omega-3 fatty acids on their own and may benefit from salmon oil supplementation. Use a product labeled for cats and follow the feeding amount for their body weight.

Does salmon oil need to be refrigerated?

Yes, after opening. Omega-3 fatty acids are sensitive to heat, light, and air. Refrigerating an open bottle helps preserve freshness and potency. Always seal the cap tightly after use.

Can too much salmon oil harm my dog?

Giving too much omega-3 can cause loose stools, weight gain, or may affect normal clotting processes. Stick to the feeding amount on the label and consult your vet if your dog has any existing health conditions.