The Most Underrated Supplement for Dogs: Omega-3 Fish Oils Explained

Omega Oils for Dogs Are the Most Underrated Supplement (And It’s Not Even Close)

If I could pick one supplement that the majority of dogs should be on, it would be omega-3 oils. Not because it’s trendy. Not because it’s a magic cure. But because the science keeps showing that omega-3 fatty acids (EPA and DHA) affect almost every system in the body.

And the crazy part? Most dogs are actually deficient. Studies show that many dogs eating commercial diets do not reach optimal omega-3 levels, which is why supplementation is often recommended for disease prevention and overall health.

Benefits We KNOW Omega-3s Have (Science Proven)

Omega-3s, specifically EPA and DHA, are anti-inflammatory. That matters because inflammation is at the root of a massive number of health problems.

Research in dogs shows omega-3 supplementation helps with:

• Joint pain and arthritis (reduced pain and lameness in studies)

• Skin and coat health

• Heart health

• Kidney disease

• Brain and cognitive function

• Immune system support

• Inflammatory diseases

• Cancer support therapy

• Quality of life and mobility

EPA and DHA work by reducing inflammatory pathways in the body, which is why they affect so many different conditions.

One 2024 study even found omega-3 supplementation reduced pain scores and improved quality of life in dogs, likely due to those anti-inflammatory effects.

Benefits We SUSPECT But Are Still Studying

This is where it gets interesting.

Researchers are currently studying omega-3s for:

• Cognitive decline in senior dogs

• Behavior and anxiety

• Autoimmune disease

• Cancer prevention/support

• Longevity and aging

• Gut health

• Nervous system health

We already know omega-3s affect cell membranes, brain tissue, immune signaling, and inflammation, so it makes sense that we keep seeing new benefits pop up in research.

In other words: we probably haven’t even discovered all the benefits yet.

Quality Over Quantity (This Is Where Most People Mess Up)

This is important:

More oil does NOT mean more omega-3.

What matters is:

• EPA amount

• DHA amount

• Purity

• Heavy metal testing

• Oxidation (rancid oil is a real problem)

• Bioavailability (how well it absorbs)

Dogs specifically need EPA and DHA, and they cannot convert plant omega-3 (ALA like flaxseed) efficiently, so plant oils are not a replacement.

So flaxseed oil ≠ fish oil. Not even close.

Fish Oil, Salmon Oil, Krill Oil, Calamari oil, Other Sources

Fish Oil

• Most researched

• High EPA and DHA per dose

• Usually cheapest

• Proven benefits in arthritis, inflammation, heart, etc.

• Downside: can oxidize quickly if low quality

  
  

Salmon Oil

• Type of fish oil

• Often more palatable

• Usually higher DHA

• Good for skin, coat, brain

  
  

Krill Oil

• Omega-3s bound to phospholipids → may absorb better

• Contains astaxanthin (antioxidant)

• Some studies show higher omega-3 levels in dogs compared to fish oil after supplementation

• More expensive

• Sustainability concerns depending on harvesting

  
  

Calamari (Squid) Oil

• Very high DHA

• Highly bioavailable

• More sustainable than many fish sources

• Often very clean and low in heavy metals

• Becoming a very popular high-end omega source

  
  

Green Lipped Mussel

• Omega-3 + joint compounds

• Great for arthritis dogs

  
  

Ethical & Clean Sourcing Matters

Fish oils can contain:

• Mercury

• Heavy metals

• PCBs

• Dioxins

  
  

High quality companies:

• Molecularly distill the oil

• Third-party test

• Use sustainable fisheries

• Use small fish (anchovies, sardines) instead of large predator fish

  
  

Sustainability also matters environmentally. Some sources like responsibly sourced squid oil may have a lower ecological impact than traditional fish or krill depending on harvesting practices.

The Simple Way to Explain Omega-3s

Here’s the easiest way to think about it:

Omega-6 = inflammatory

Omega-3 = anti-inflammatory

Most dogs today eat diets very high in omega-6 and very low in omega-3.

So adding omega-3 is basically rebalancing the body, not just “adding a supplement.”

If I Had to Rank Omega Sources (Overall Quality)

Not by price. Not by marketing. By quality and absorption.

Top Tier

• Calamari oil

• Krill oil

• Small fish oil (anchovy, sardine, mackerel)

Good

• Salmon oil

• Fish oil (high quality)

Not Enough Alone

• Flaxseed oil

• Chia oil

• Hemp oil

Because again, dogs need EPA + DHA, not just “omega-3” on a label.

Bottom Line

Omega-3s are not just a skin and coat supplement.

They are:

• Brain support

• Joint support

• Inflammation control

• Immune support

• Heart support

• Kidney support

• Aging support

• Possibly cancer support

• Possibly behavior support

• Possibly longevity support

It’s not a magic pill but if there was one supplement that affects the most systems in the body at once, omega-3 would probably be it and that’s why it’s the most underrated supplement in dogs!