Omega-3 for Dogs: The Complete Guide

Omega-3s are far more than a nutritional trend; they are important building blocks for the health and well-being of our canine companions. Recognised for their ability to modulate inflammation and support vital functions, these essential fatty acids play an important role in canine nutrition.

Discover the science behind omega-3s and how to optimise your dog's intake to support joint, cognitive and skin health.

What are Omega-3?

Omega-3s belong to the family of polyunsaturated fatty acids. They are classed as essential because dogs, like humans, cannot produce them in adequate amounts. They must therefore be supplied through food or supplementation.

A fatty acid is a basic component of fats. Omega-3s are called 'polyunsaturated' because of their chemical structure, which makes them particularly flexible and useful in cell membranes.

Within this family, three fatty acids are at the centre of scientific interest:

• ALA (Alpha-Linolenic Acid): It is the main precursor, found primarily in plant-based sources such as flaxseed, hemp and walnuts.
• EPA (Eicosapentaenoic Acid): Mainly derived from marine organisms such as algae, fish and crustaceans, it plays a key role in regulating inflammation (Bauer, 2007).
• DHA (Docosahexaenoic Acid): Also of marine origin, it is important for the development and structure of the nervous system, retina and cell membranes, as well as for cartilage protection (Bauer, 2011).

In dogs, the ability to convert ALA into EPA and DHA is very limited, at less than 10% (National Research Council, 2006). To support biological effectiveness, it is therefore crucial to prioritise direct sources of EPA and DHA.

Mechanism of Action of Omega-3

The benefits of omega-3s stem from their ability to become incorporated into cell membranes, helping the body function effectively at a fundamental level.

Omega-6 / Omega-3 Balance

Commercial dog food often contains considerably more omega-6 than omega-3, partly because of vegetable oils such as corn or sunflower oil. Omega-6 fatty acids are precursors to pro-inflammatory molecules such as series 2 prostaglandins and leukotriene B4.

The Omega-6/Omega-3 Balance: Omega-6 fatty acids are necessary, but an excess can provide the raw materials for inflammatory pathways. An imbalance may therefore promote chronic inflammation (Wander et al., 1997).

When EPA is available in sufficient quantities, it competes with omega-6 fatty acids. It takes their place in cell membranes and in enzymatic reactions (biochemical processes driven by enzymes), leading to the production of mediators that are less harmful to tissues (McPhee et al., 2007; Treschow et al., 2007).

Regulation of Inflammation and Joint Protection

EPA and DHA do not simply slow inflammation; they also help resolve it.

• Action on Enzymes: EPA modulates the activity of COX and LOX enzymes, reducing the production of mediators involved in pain and swelling in the joint (Mehler et al., 2016; Adler et al., 2018). Cyclooxygenases and lipoxygenases are enzymes that catalyse the conversion of fats into inflammatory signals. Omega-3s act as a natural 'brake' on these processes.
• Resolvins, Protectins and Homeostasis: EPA and DHA are the precursors to a class of 'pro-resolving' molecules: resolvins and protectins. These compounds help bring the inflammatory response to an end and restore tissue balance, a process known as homeostasis (Calder, 2015).
• Cellular Protection: DHA, in particular, contributes to stabilising subchondral bone by regulating the activity of osteoclasts (cells responsible for bone resorption), thereby playing an important chondroprotective role in protecting articular cartilage. Osteoclasts break down bone tissue. DHA helps regulate their activity, protecting the bone beneath the cartilage. Its chondroprotective role also helps protect cartilage cells (Rahman et al., 2008; Ma et al., 2023; Wang et al., 2016).

Proven Benefits of Omega-3 in Dogs

Omega-3s, especially EPA and DHA, are the best-documented active ingredients in canine nutrition for a variety of indications:

Mobility and Joint Comfort

In 2022, researchers from the Faculty of Veterinary Medicine at the University of Montreal published a systematic review of available clinical studies on dietary supplements for arthritic dogs and cats (Barbeau-Grégoire et al., 2022) and concluded that omega-3s were the most effective.

Omega-3 are the most effective and best-documented active ingredients clinically, far ahead of other widely marketed ingredients such as glucosamine, collagen or plant extracts.

Barbeau-Grégoire

• Improved mobility: Clinical studies show a reduction in lameness and improved ability to bear weight on the limb (Roush et al., 2010; Moreau et al., 2013).
• Pain relief: Reduction in joint stiffness and potentially a decreased need for non-steroidal anti-inflammatory drugs (NSAIDs) (Mehler et al., 2016; Fritsch et al., 2010).
• Tissue preservation: Protection of cartilage against chronic enzymatic degradation (Hansen et al., 2008).

Coat Quality

Because of their anti-inflammatory properties, omega-3s can provide valuable support for pruritic or atopic dermatitis:

• Strengthening of the skin barrier.
• Reduction of itching (pruritus) and alopecia caused by self-trauma (Magalhães et al., 2021).
• Improvement of coat quality: shinier and denser.

Brain Function and Cognitive Development

DHA is a major constituent of neuronal membranes (the outer structure of nerve cells). Adequate intake is important:

• In puppies: It supports neurological development, learning and motor skills (Rodrigues et al., 2023).
• In senior dogs: It helps to preserve cognitive function and neuronal plasticity (the brain's ability to form new connections essential to memory and learning) in the face of ageing (Bauer, 2011).

Cardiovascular Support

Omega-3s contribute to cardiovascular regulation by helping to maintain balanced blood pressure and supporting healthy triglyceride levels (Smith et al., 2007; Nasciutti et al., 2021).

The Best Sources of Omega-3

Not all sources of omega-3 are equal, particularly in terms of EPA and DHA purity, traceability and environmental impact.

Plant-based Sources

Flaxseed, rapeseed and hemp oils are rich in ALA, but dogs convert this precursor into EPA and DHA inefficiently. These oils provide beneficial fats, but cannot effectively address an existing omega-3 deficiency.

Classic Marine Sources

• Oily Fish (Fish Oils): Traditionally rich in EPA and DHA, oily fish such as sardines, anchovies and mackerel may nevertheless be exposed to contaminants such as heavy metals and PCBs. Their use may also be associated with overfishing and declining omega-3 levels in fish (Lloret et al., 2025; Sprague et al., 2016).
• Antarctic Krill: Provides omega-3s in phospholipid form, which is readily absorbed. However, krill is a keystone species in the Antarctic food chain, and large-scale harvesting can put pressure on the marine ecosystem (Meyer et al., 2025; Zhang et al., 2025).

Sustainable Marine Sources

The best sources combine high levels of active omega-3s (EPA and DHA) with impeccable traceability:

• Microalgae Oil: Microalgae are a primary source of marine omega-3s. Grown in fermenters, they produce high-purity DHA with no risk of marine heavy-metal contamination and without putting pressure on the oceans. Microalgae oil is a sustainable, highly pure alternative to fish oil.
• New Zealand Green-Lipped Mussel Oil (Perna canaliculus): This is a unique source. Its cultivation is strictly regulated and environmentally responsible. It provides not only EPA and DHA, but also rare omega-3s such as ETA (Eicosatetraenoic Acid), known for its specific action on the LOX enzyme and its contribution to the overall anti-inflammatory effect. Its benefits for mobility have been demonstrated in clinical studies involving dogs.

What Omega-3 Dosage for Dogs?

The dose of omega-3s, expressed as total EPA + DHA, is a key factor in effectiveness. It should be adjusted to the intended purpose and may be determined with veterinary guidance if necessary.

At present, French and European authorities have not established recommended omega-3 dosages for dogs. However, guidance can be drawn from doses shown to be effective in the scientific literature:

Even without apparent joint symptoms, moderate omega-3 supplementation can help maintain joint flexibility, support the immune system and preserve skin and coat quality.

In healthy adult dogs, a daily intake of 14 mg of EPA+DHA per kilogram of body weight is recommended.

National Research Council

To make daily dosing easier, here is a reference guide by dog size:

These intakes can be provided by enriched food or by a supplement containing a high-quality omega-3 source such as green-lipped mussel oil or algae), well tolerated over the long term. They help maintain the mechanisms that regulate inflammation and support healthy ageing.

Choosing the Right Omega-3 Supplement for Your Dog

The choice of a supplement should not be based solely on price, but also on quality, stability and bioavailability (the body's ability to absorb ingested nutrients).

Concentration and Clinical Efficacy

An omega-3 supplement is only effective if the active forms, EPA and DHA, are present in sufficient quantities and in forms with demonstrated benefits.

• Check the active ingredients: Only marine omega-3s, EPA and DHA, have a clinically demonstrated effect on inflammation and mobility (Barbeau-Grégoire et al., 2022). Plant-based omega-3s, in the form of ALA, are converted inefficiently in dogs.
• Watch the concentration: Avoid products that feature well-known ingredients in nominal amounts. Effectiveness depends on reaching doses supported by scientific evidence.
• Prefer the liquid form: Liquid oil is particularly suitable for omega-3s, offering good absorption and digestive tolerance compared with powders or chews, which are often underdosed.

Purity, Oxidation and Stability

The quality of an omega-3 oil is determined by its freshness and purity, which support its long-term effectiveness.

• Stability and Oxidation: The oil must be non-oxidised. Oxidation, measured by the TOTOX index, makes the oil rancid and ineffective. A TOTOX index below 26 is an important indicator of quality. It helps confirm that the oil is fresh and pure, meaning it has not become rancid through contact with air.
• Contaminant Testing: A reputable laboratory should provide release analyses confirming that environmental pollutants such as heavy metals, dioxins and PCBs are absent or remain within safe limits. This is particularly important for marine sources susceptible to bioaccumulation.
• Traceability and Extraction: Look for full transparency regarding the origin of raw materials, including the fishing, farming or cultivation area and method, as well as the extraction process used. Gentle, solvent-free methods are preferable.

PERNIXOL®

Choosing PERNIXOL® means choosing a formula developed to avoid the compromises associated with underdosed or clinically unproven supplements. Based on scientific evidence, it combines effectiveness, quality and natural ingredients.

PERNIXOL® is more than a supplement; it reflects a commitment to your dog's long-term well-being.

Its formula combines premium, highly concentrated, stable and traceable marine active ingredients:

1. New Zealand Green-Lipped Mussel Oil (Perna canaliculus): Farmed in the protected waters of the Marlborough Sounds, it provides the essential fatty acids EPA and DHA, as well as the rare omega-3 ETA, which contributes to its anti-inflammatory activity. It is the flagship ingredient for supporting canine mobility.
2. High-Purity Microalgae Oil (Schizochytrium sp.): Grown through fermentation to minimise the risk of contaminants, it provides a highly concentrated source of DHA and helps protect your dog's cartilage.

Manufactured in our laboratory in St-Jean-d'Illac, France (Gironde), PERNIXOL® is the only liquid formula rich in sustainable Omega-3 for your dog's joint health.

Easy to dose and with a taste dogs love, PERNIXOL® gives your dog back the freedom to run, play and share every moment by your side without restraint.

PERNIXOL®420

dogs over 20kg 420mg EPA+DHA per ml

PERNIXOL®210

dogs 10 to 20kg 210mg EPA+DHA per ml

PERNIXOL®70

dogs under 10kg 70mg EPA+DHA per ml

Conclusion

Omega-3 are essential to the lasting health of your dog. This guide has demonstrated that not all Omega-3 are equal: only EPA and DHA, derived from pure and traceable marine sources, have the power to modulate inflammation and protect joints and the brain. Efficacy does not depend on chance, but on adherence to precise dosing and impeccable quality (low TOTOX, optimal concentration).

By choosing a supplement such as PERNIXOL®, you are opting for science in the service of well-being, guaranteeing your companion the optimal intake to regain suppleness and vitality.

All our Omega-3 guides

What Are Omega-3s? (Role, Benefits, Diet)

What Are Omega-3 EPA and DHA?

Veterinary studies on Omega-3 and dog arthritis

The best Omega-3 sources

What Omega-3 Dosage for Joint Disorders in Dogs?

Omega-3 for dogs: phospholipids or triglycerides?

Omega-3 and TOTOX: The Quality Guide

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This guide was written by the R&D team at Laboratoire Sensilia, experts in animal nutrition.