What Are Omega 3, 6 & 9 Fatty Acids in Cat Food – And Why All Three Matter

Most cat owners think about protein first. They should. But the second question, one fewer people ask, is where the fat comes from and whether it’s doing anything useful.

Omega fatty acids are listed on almost every premium cat food bag. They appear in the small print, sometimes in the guaranteed analysis, occasionally called out on the front panel as a selling point. What they rarely come with is a clear explanation of what each one actually does, how they work together, and why the source matters as much as the presence.

This article covers biology plainly. By the end, you’ll know exactly what omega 3, 6 and 9 fatty acids do inside your cat’s body, what to look for on a label, and which questions are worth asking of any food you’re considering, including your current one.

Why Cats Cannot Produce Essential Fatty Acids on Their Own

Cats are obligate carnivores. Their digestive systems evolved to extract everything they need from animal tissue, which means they have lost certain metabolic pathways that dogs and humans retain. One consequence of this is that cats cannot synthesise two critical fatty acids in meaningful quantities: linoleic acid (an omega 6) and alpha-linolenic acid (an omega 3). These must come from food.

There is a second, more specific gap. Cats have very limited ability to convert plant-derived omega 3 into the forms their bodies actually use: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). A human eating flaxseed oil can convert a proportion of it into EPA and DHA. A cat largely cannot. This is why the source of omega 3 in cat food is not a minor detail, and it informs how Hurayra selects and declares every fat source in its dry cat food formulations.

FEDIAF, the European industry body that sets nutritional guidelines for companion animal feed, specifies minimum requirements for both linoleic acid and arachidonic acid (a long-chain omega 6) in adult cat food. These are not optional considerations. They are established nutritional requirements with defined minimum levels, because the consequences of deficiency in cats are well-documented: poor coat condition, compromised skin barrier function, and impaired reproductive health.

Understanding this biology is why the conversation about omega fatty acids in cat food is worth having properly.

What Omega 3 Does in a Cat’s Body

Omega 3 fatty acids have a well-established role in reducing inflammation at the cellular level. In cats, EPA and DHA are the forms that matter. DHA in particular is concentrated in neural tissue and the retina, since brain and eye development in early life depend on it, which is why it appears in kitten formulations. EPA plays a role in managing inflammatory responses, which has practical relevance for cats with joint stiffness, skin sensitivities, or persistent coat problems.

The two most reliable dietary sources of EPA and DHA are marine fish and fish oil. Salmon, mackerel, anchovy and tuna are commonly used in commercial cat food. Tuna, in particular, delivers a meaningful omega 3 profile when used as a primary protein source rather than a flavouring agent.

A cat eating food where tuna appears as the first or second named ingredient is getting a meaningfully different omega 3 intake than one eating food where fish is listed mid-label as “fish meal” or “fish derivatives”, categories that offer no transparency about species, processing, or fat composition.

Omega 3 is also the fatty acid most affected by processing temperature. High-heat extrusion, used in most dry kibble production, can degrade omega 3 content if the formulation does not account for it. Foods that list omega 3 in their guaranteed analysis have typically either used lower-temperature processing, added omega 3 post-extrusion, or used stabilised fish oil to compensate for heat loss.

What Omega 6 Does in a Cat’s Body

Omega 6 is more abundant in most commercial cat foods than omega 3, partly because it is easier to source and more heat-stable. The key omega 6 fatty acids for cats are linoleic acid and arachidonic acid.

Linoleic acid supports skin barrier integrity and coat condition. A deficiency shows up visibly: dull fur, increased shedding, dry or flaky skin. Arachidonic acid, which cats cannot synthesise from linoleic acid the way other mammals can, must come directly from animal fat. This is another reason plant-heavy diets are nutritionally inappropriate for cats. They can provide linoleic acid, but not arachidonic acid.

Chicken fat and chicken liver are reliable sources of arachidonic acid. Tuna and other oily fish also contribute. Formulations that rely primarily on plant oils for their omega 6 content may meet linoleic acid requirements while falling short on arachidonic acid, which matters specifically in cats. Hurayra’s chicken and tuna dry food uses animal fat as the primary omega 6 source, not plant oil substitutes.