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Omega-3 fatty acids are essential for your dog's joint health. But are all sources equal? A breakdown of plant and marine EPA/DHA sources and their effects.
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Buying GuidesWhether maintaining a shiny coat, supporting good cognitive function in a puppy or senior dog, or sustaining vitality and mobility, Omega-3 fatty acids are central to canine health. These polyunsaturated fatty acids, known as essential, cannot be synthesised by your dog's body, making dietary intake indispensable.
Their importance is primarily linked to their ability to modulate the inflammatory response and restore a healthy balance against pro-inflammatory Omega-6 fatty acids, too often favoured by modern diets. However, this is where the challenge lies for owners: the Omega-3 family is vast, but their effectiveness relies solely on two active forms, EPA and DHA.
In this article, we will explain the difference between ALA (the plant precursor with low conversion) and the active forms. We will then detail why marine Omega-3 sources are crucial for effectiveness, comparing traditional options (fatty fish) with high-quality, sustainable alternatives such as microalgae and green lipped mussel, supported by clinical evidence.
Omega-3 fatty acids are essential fatty acids that the body cannot synthesise. Their presence in the diet is therefore essential. They participate in numerous biological processes that influence overall health, mobility, vitality and longevity.
Before detailing their mechanism of action, it is useful to recall their main recognised effects in dogs:
These effects are explained by a common factor: the ability of Omega-3 fatty acids to modify the lipid composition of membranes, which directly influences how cells respond to internal and external stimuli.
Modern diets largely favour Omega-6 intake, creating a pro-inflammatory environment. Omega-3 fatty acids then play a balancing role, restoring a more functional membrane composition. This balance is essential for inflammatory mechanisms to activate when necessary, then switch off correctly.
Only directly active Omega-3 sources (EPA and DHA, detailed in the following section) can effectively correct this imbalance, as conversion of plant-based Omega-3 into active forms remains low in dogs.
The Omega-3 family is broad: more than a dozen fatty acids have been identified by research. Yet in nutrition, three of them occupy a central place. They represent the bulk of Omega-3 fatty acids found in the diet and their physiological effects are the best documented: ALA, EPA and DHA.
Alpha-linolenic acid (ALA) is the most abundant plant-derived Omega-3, notably in flax, chia seeds or certain nuts.
Although essential, it is a precursor: to become physiologically active, it must be converted to EPA then DHA. Conversion of ALA to EPA is low, and conversion to DHA even more limited, to the point that ALA contributes very little to actual enrichment of tissues with long-chain Omega-3 fatty acids.
This finding explains why plant sources, although nutritionally interesting, cannot replace a source directly rich in EPA and DHA when seeking a targeted effect on inflammation, mobility or cognitive function.
EPA (eicosapentaenoic acid) is a long-chain Omega-3 found in fatty fish, algae, krill, and crustaceans such as green lipped mussel.
Its main role is explained by its integration into membranes and its influence on inflammatory metabolic pathways. By modulating the production of mediators derived from COX and LOX enzymes, EPA enables a more controlled inflammatory response, less aggressive to tissues.
This mechanism supports its interest in joint disorders, where chronic inflammation contributes to progressive cartilage deterioration.
DHA (docosahexaenoic acid) has a structure that makes it essential to the functioning of membranes in the nervous system, retina and many cells with high metabolic activity.
DHA gives membranes essential fluidity, which promotes nerve transmission, learning ability, neuronal plasticity and vision. Its structural role therefore extends well beyond the inflammatory framework and contributes to the stability of many tissues sensitive to ageing or oxidative stress.
Among the many Omega-3 fatty acids identified, ALA, EPA and DHA are the only ones present in truly significant proportions in the diet and the only ones whose impact on health is solidly demonstrated.
ALA is a widely present but poorly converted precursor, while EPA and DHA are the active forms directly involved in inflammation modulation, membrane structure and overall health.
It is direct dietary intake of EPA and DHA that truly determines their level in cell membranes, not conversion from ALA.
This distinction is fundamental to understanding why the quality of an Omega-3 source depends mainly on its ability to provide sufficient intake of EPA and DHA.
Discover our guide to Omega-3
Plants mainly provide ALA, an essential fatty acid that is poorly converted to EPA and DHA. They are most often found in oil form, used in human or animal nutrition. Their nutritional interest exists, but their physiological reach remains limited when targeting a specific effect on inflammation or mobility.
Certain plants naturally concentrate large amounts of ALA. Among the best known are flax, chia, walnut, rapeseed, perilla, hemp or camelina oils.
These oils are often promoted for their nutritional properties, but, as scientific literature shows, their effectiveness on tissues depends on conversion to EPA and DHA — a conversion that is very limited in dogs.
Ahiflower contains ALA but also SDA (stearidonic acid), an intermediate fatty acid whose conversion to EPA is more efficient than that of ALA alone. This characteristic makes it a more effective plant source, but it still cannot replace a marine source when the goal is to act on the inflammatory response or joint mobility.
Fatty fish have historically been one of the most important sources of EPA and DHA, as they feed on microalgae and plankton naturally rich in Omega-3. Their nutritional profile depends on many parameters (species, diet, geographic area, season, fishing or farming method) but they generally provide significant amounts of EPA and DHA.
They also contain vitamins A and D, antioxidant pigments (notably astaxanthin in wild species), and various mono- and polyunsaturated fatty acids.
Levels vary, but the following species are among the most notable:
Small fish oils (anchovy, sardine) are preferred in many supplements, as their low position in the food chain limits contaminant bioaccumulation.
Fatty fish are exposed to the phenomenon of bioaccumulation, which leads to the progressive accumulation of environmental contaminants such as heavy metals (lead, cadmium) in their adipose tissues and organs over their lifetime.
The longer a fish lives and the higher it sits in the food chain, the greater its heavy metal concentrations. This is why:
Purification (deodorisation, molecular distillation) allows highly controlled oils to greatly reduce these contaminants, but this parameter remains a major issue in final quality.
Several recent studies highlight a concerning phenomenon: Omega-3 content in wild fish is declining in certain regions, linked to:
A study published in 2025 (Lloret et al.) conducted in the Mediterranean Sea shows that annual Omega-3 (EPA + DHA) catches fell from approximately 15 tonnes to just 6 tonnes between 2000 and 2023, a decline of nearly 60%. The authors attribute this decrease to fishing pressure on small pelagic fish, climate change and reduced primary Omega-3 production by microalgae.
Fish farms have traditionally used fish meal and fish oil to feed fish. This practice itself contributes to pressure on wild fish stocks.
To reduce this dependence, some of this fish meal and oil has been replaced by other sources such as soy, which lacks Omega-3, impacting Omega-3 content in fish
In some farms, EPA + DHA levels in farmed salmon fell by approximately 50% over a decade.
Ultimately, while fatty fish remain a major source of EPA and DHA, their ecological, nutritional and health limitations highlight the need to turn to more stable, sustainable and better controlled alternatives.
Marine microalgae are now among the most promising sources of long-chain Omega-3. In fact, it is from microalgae that fish themselves obtain their Omega-3: they are the primary source in the marine food chain.
Cultivated under controlled conditions, they allow production of oils particularly rich in DHA (30 to 55% depending on strains), sometimes also in EPA, without resorting to fishing.
Microalgae oils come mainly from strains cultivated in fermenters, including:
In a context where Omega-3 content in wild fish is declining (fishing pressure, water warming), microalgae appear as a future solution for stable and traceable Omega-3.
The green lipped mussel (Perna canaliculus) is a species endemic to New Zealand. Its farming is among the most strictly regulated marine industries in the world: farming areas are located in protected biodiversity reserves, and harvest quotas are controlled by the New Zealand government to ensure species sustainability and preservation of its ecosystem.
The production cycle is naturally environmentally respectful. After a hatchery phase where young mussels are fed exclusively on microalgae, they are transferred to open sea, attached to biodegradable ropes suspended from floating lines. This technique does not disturb seabeds, uses no artificial feed or chemical treatments, and relies entirely on the mussels' ability to filter subantarctic phytoplankton, particularly rich in natural antioxidants.
This diet explains the unique lipid richness of green lipped mussel, which provides not only EPA and DHA, but also rarer fatty acids such as ETA (eicosatetraenoic acid), involved in modulating inflammatory responses.
Green lipped mussel supplements exist in powder or oil form. Green lipped mussel oil can contain up to 15 times more Omega-3 as its fatty acids are preserved during extraction, unlike powder.
Several extraction processes exist for green lipped mussel oil:
Beyond its nutritional quality, green lipped mussel has a large number of veterinary clinical studies demonstrating effectiveness on:
These findings explain why green lipped mussel has become a reference ingredient in formulas for canine joint support: natural, traceable, sustainable and clinically documented.
Antarctic krill (Euphausia superba) is often valued for its Omega-3 in phospholipid form, easily integrated into cell membranes. But its exploitation today raises major concerns.
Krill is a pillar of the Antarctic food chain: whales, seals, penguins and many fish depend on it directly. It also plays a role in the carbon cycle, consuming carbon-rich phytoplankton and transferring it to the depths via its waste, thereby helping trap CO₂ in the ocean.
Krill is mainly fished to feed salmon and give them the pink colour appreciated by consumers. It is also used to manufacture Omega-3-rich supplements.
But krill fishing weakens the ecosystem. Several reports highlight tensions: concentration of fishing in predator feeding zones, record catches, and early fishery closures in 2025 after quota exceedance. In an environment already disrupted by ice shelf melt and water warming, krill overfishing appears as an aggravating factor.
| Source | Primary Omega-3 Form | Effectiveness for Dogs (EPA/DHA) | Impact & Sustainability |
|---|---|---|---|
| Seeds / Plant Oils (Flax, Chia, Walnuts, etc.) | ALA (Alpha-Linolenic Acid) | Very low. Does not effectively improve the Omega-6/Omega-3 ratio. | General nutritional value, but limited physiological impact on targeted outcomes (e.g. inflammation). |
| Ahiflower | ALA + SDA (SDA is more readily converted into EPA) | Low to Moderate. More effective than traditional plant oils, but cannot replace a marine source. | More advanced plant-based source, but still limited for targeted therapeutic or preventive goals. |
| Fatty Fish (Sardines, Anchovies, Salmon) | EPA & DHA (Active forms) | Direct and Good. Well-established benefits for inflammation and cognitive function. | Health & Environmental Concerns: Risk of heavy metal bioaccumulation (especially in larger predatory fish). Declining Omega-3 content due to overfishing and ocean warming. |
| Marine Microalgae (Schizochytrium sp., etc.) | Mainly DHA (30–55%) | Direct and Excellent. Primary source of Omega-3s in the marine food chain. | Purity Advantage: Produced in controlled fermentation systems, ensuring exceptional purity and stability. |
| Green-Lipped Mussel (Perna canaliculus) | EPA, DHA & ETA (A unique fatty acid profile) | Direct and Excellent. Clinically proven veterinary efficacy for mobility and joint comfort. | Highly Traceable: Sustainably farmed in New Zealand under strict environmental regulations. |
| Antarctic Krill | EPA & DHA (Mainly in phospholipid form) | Direct and Very Good. High bioavailability. | Major Environmental Concerns: A keystone species in the Antarctic food web (whales, seals, penguins). Risk of overharvesting. |
Understanding the distinction between plant ALA and the active forms EPA and DHA is fundamental. It is the level of direct intake of these marine fatty acids that truly determines the effectiveness of supplementation on overall health, nerve function, and above all, inflammation modulation that directly impacts your dog's mobility.
Facing the purity and sustainability challenges encountered by traditional marine sources (fatty fish, krill), the solution lies in safer and traceable alternatives, while being clinically proven.
It is with this high-quality, proven effectiveness and sustainability approach that PERNIXOL® was formulated: joint support rich in marine Omega-3.
PERNIXOL® relies on an optimal combination:
Additive-free, easy to administer and highly digestible, PERNIXOL® offers you the assurance of a product formulated by Laboratoire Sensilia, for optimal joint comfort and vitality.
This article was written by the R&D team at Laboratoire Sensilia, experts in animal nutrition.
