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Understanding Essential Fatty Acid Needs: Why Omega-3s Matter

A variety of nutrient rich foods are arranged on a wooden surface with soft, natural light. The foreground features a glass bowl filled with golden fish oil capsules. In the blurred background are foods such as salmon, avocado, and various nuts and seeds.

Dr. Judy |

When people think about canine nutrition, protein usually gets all the attention. But essential fatty acids (EFAs) are also an important part of a pet’s overall nutrition. These fats support normal skin, brain, joint, heart, and immune function, and play a role in how the body manages natural inflammatory processes. Because dogs cannot produce certain fatty acids in sufficient amounts, they must be obtained through the diet.

Among all essential fats, omega-3 fatty acids deserve special attention because many modern canine diets provide relatively low amounts of them while supplying higher levels of omega-6. This imbalance may contribute to an increased inflammatory state, which is associated with concerns such as dry skin, reduced mobility, and age-related changes.

What Makes a Fatty Acid “Essential”?

A fatty acid is considered essential when the body cannot produce enough of it internally. For dogs, the primary essential fatty acids include:

  • Linoleic acid (LA) – an omega-6 fatty acid required for normal skin and coat function

  • Alpha-linolenic acid (ALA) – a plant-based omega-3 fatty acid

  • EPA (eicosapentaenoic acid) – a marine-based omega-3

  • DHA (docosahexaenoic acid) – another marine omega-3 that supports normal brain and nervous system function

Dogs require both omega-6 and omega-3 fats, but many commercial diets already contain ample omega-6 while providing limited amounts of long-chain omega-3s.

The types of ingredients used in a dog’s diet can also influence this balance. Grass-fed, pasture-raised, and wild-caught animal proteins tend to have a more favorable omega-6 to omega-3 ratio compared to conventionally raised sources, which are often higher in omega-6 fatty acids. Choosing these higher-quality protein sources can help support a more balanced fatty acid intake as part of the overall diet.

Even with thoughtful sourcing, however, many diets may still benefit from the inclusion of additional long-chain omega-3s. Supplementing with EPA and DHA can help support overall health and provide additional support beyond baseline requirements.

The Three Main Types of Omega-3 Fatty Acids

It’s important to understand that the different omega-3 fatty acids each serve different roles in the body. Plant-sourced omega-3 (ALA) is not a substitute for marine-sourced omega-3s like EPA and DHA, but each contributes to overall nutritional balance.

1. ALA (Alpha-Linolenic Acid)

ALA is the short-chain omega-3 found in plant ingredients such as:

  • flaxseed

  • chia seed

  • hempseed

  • ahiflower oil

  • camelina oil

ALA helps support:

  • normal skin hydration

  • coat appearance

  • maintenance of the skin’s protective barrier

ALA also plays a role in balancing linoleic acid (LA), the primary omega-6 fatty acid involved in skin health.

However, ALA has a limitation: dogs convert only a small amount of it into the longer-chain omega-3s EPA and DHA. This means plant-based omega-3 sources can contribute to overall fatty acid intake, but they are not equivalent to marine-based sources of EPA and DHA.

In practical terms:

  • Plant-based omega-3 sources provide ALA

  • They do not provide meaningful amounts of EPA or DHA directly

  • Marine-based sources are the primary dietary source of EPA and DHA

2. EPA (Eicosapentaenoic Acid)

EPA is a long-chain omega-3 fatty acid that supports normal inflammatory responses in the body. It may help:

  • support joint function and mobility

  • maintain skin health

  • support cardiovascular function

  • promote a balanced immune response

Because EPA is involved in inflammatory pathways, it is often included in diets formulated for aging dogs or those needing additional joint and skin support.

3. DHA (Docosahexaenoic Acid)

DHA supports:

  • normal brain development in puppies

  • cognitive function in adult and senior dogs

  • eye and retinal health

  • nervous system function

DHA is particularly important during growth and development, and may also help support cognitive function as dogs age.

Together, EPA and DHA provide long-chain omega-3s that the body can use directly.

Why EPA and DHA Matter More Than ALA

Some pet foods highlight omega-3 content due to plant ingredients like flaxseed. However, ALA is not nutritionally equivalent to EPA and DHA.

Dogs utilize EPA and DHA more readily because they do not require conversion. Marine sources naturally provide these forms, while plant sources rely on a conversion process that may be limited.

A simple way to think about it:

  • ALA = supports skin and barrier function

  • EPA = supports normal inflammatory balance

  • DHA = supports brain and nerve function

Each plays a different role in supporting overall health.

Best Sources of Omega-3 for Dogs

The most direct dietary sources of EPA and DHA are marine-based ingredients.

Marine-Based Sources

Common options include fresh or canned oily fish and their oils:

  • sardines

  • salmon

  • anchovy

  • herring

  • mackerel

Other marine-based sources include:

  • calamari oil

  • krill oil

  • green-lipped mussel oil

  • algae oil

These provide EPA and DHA in forms that dogs can readily utilize.

Algae Oil

Algae is the original source of marine omega-3s, as fish obtain these fats through their diet.

Algae oil:

  • provides DHA (and sometimes EPA)

  • offers a non-fish alternative

  • is considered a more sustainable source

It may be a suitable option for dogs that do not tolerate other marine-based ingredients.

Signs a Dog May Benefit from Additional Omega-3

Some dogs may benefit from increased omega-3 intake if they show:

  • dry or flaky skin

  • dull coat

  • increased shedding

  • stiffness or reduced mobility

  • age-related behavioral or cognitive changes

These signs can develop gradually and may be influenced by multiple factors, including diet.

How Much Omega-3 Does a Dog Need?

Omega-3 needs vary based on:

  • body weight

  • life stage

  • activity level

  • overall diet

Recommendations are often expressed in terms of combined EPA and DHA, since these are the biologically active forms.

General intake ranges often cited include:

  • 10-20 mg total EPA + DHA per pound of body weight per day for maintenance

  • 45 mg total EPA + DHA per pound of body weight per day for pets that need more support

Because products vary widely in EPA and DHA content, it’s important to evaluate the actual amount of these fatty acids rather than total oil content.

Balancing Omega-6 and Omega-3

Omega-6 fatty acids are essential and play an important role in normal skin function. The key consideration is balance.

Diets that are disproportionately high in omega-6 relative to omega-3 may promote an imbalanced inflammatory response. While an often-cited target ratio is around 5:1 (omega-6 to omega-3), many commercial diets contain significantly higher ratios.

The goal is not eliminating omega-6, but restoring a healthier balance between the two. When appropriately balanced, these fats work together to support overall health.

What about cats?

Cats and kittens have distinct fatty acid requirements compared to dogs. They lack the enzyme  delta-6 desaturase which prevents them from converting some fatty acids into others. Arachidonic acid (AA), an omega-6 fatty acid, is essential for cats but not for dogs, due to their inability to synthesize it from linoleic acid. Unlike dogs, cats have a limited ability to convert short-chain omega-3 fatty acids (ALA) into the long-chain forms EPA and DHA. As a result, preformed EPA and DHA from dietary sources are especially important in feline nutrition. 

Because of this metabolic limitation, EPA and DHA are considered key components of a balanced diet for cats especially during growth, reproduction, and other life stages with increased nutritional demands.

When provided in appropriate amounts, omega-3 fatty acids may help support:

  • skin and coat condition

  • joint function and mobility

  • heart and brain function

  • eye health

  • immune system function

  • a balanced inflammatory response

A commonly referenced intake range for cats is 10–20 mg of combined EPA + DHA per pound of body weight per day, though individual needs may vary based on diet, life stage, and overall health.

As with dogs, marine-based sources are the most direct and reliable way to provide these essential long-chain omega-3 fatty acids for cats.

Final Thoughts

When evaluating a dog’s diet, omega-3s are an important consideration. While plant-based ALA contributes to skin and coat health, EPA and DHA provide additional support for whole-body function.

For most dogs, omega-3s can be supplied through:

  • oily fish

  • purified marine-based oils (such as fish oils, calamari oil, etc.)

  • sustainably sourced algae oil

For dogs with sensitivities to marine-based ingredients, plant-based omega-3 sources can still provide ALA. Although conversion is limited, this pathway may contribute small amounts of EPA and DHA.

For cats, omega-3 nutrition is even more dependent on diet, as they require EPA and DHA from animal or marine-based sources due to their limited ability to convert ALA. 

Providing appropriate types and amounts of omega-3 fatty acids can help support normal skin condition, mobility, cognitive function, and overall wellness.

 
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