Omega-3 vs. Omega-6 for Dogs & Cats: Complete Guide
You’ve probably seen Omega-3 and Omega-6 fatty acids mentioned on pet food labels, fish oil supplements, and skin and coat products. Both play important roles in your pet's health—but what exactly is the difference between them?
And if both are important, why do we hear so much more about supplementing Omega-3?
Understanding how these fatty acids work can help you make better decisions about your dog's or cat's everyday nutrition.
What Are Omega-3 and Omega-6 Fatty Acids?
Omega-3 and Omega-6 are families of polyunsaturated fatty acids (PUFAs). Some fatty acids are considered essential because dogs and cats cannot produce enough of them on their own and therefore need to obtain them through their diet.
The names "Omega-3" and "Omega-6" refer to the position of the first double bond in the fatty acid's chemical structure when counted from the omega end of the molecule. It sounds like a tiny structural difference, but it affects how these fatty acids are metabolized and used throughout the body.
Most importantly, Omega-3 and Omega-6 aren't competitors where one is "good" and the other is "bad." Pets need appropriate amounts of both.
What Does Omega-3 Do for Dogs and Cats?
Omega-3 fatty acids are widely studied for their roles in normal inflammatory responses and overall health. The three Omega-3 fatty acids you will commonly encounter are:
ALA (Alpha-Linolenic Acid) – Primarily found in plant sources such as flaxseed and certain seeds and oils.
EPA (Eicosapentaenoic Acid) – Commonly obtained from marine sources such as fish and fish oil.
DHA (Docosahexaenoic Acid) – Also abundant in marine sources and particularly important for neurological and visual development.
EPA and DHA are usually the Omega-3s of greatest interest when choosing a fish oil supplement for dogs or cats.
Potential Benefits of Omega-3
Appropriate amounts of Omega-3 fatty acids may help support:
- Normal inflammatory responses
- Healthy skin and coat
- Cardiovascular health
- Immune function
- Brain and neurological health
- Normal development
- Joint health
Where Does Omega-3 Come From?
Common dietary sources of Omega-3 include:
- Salmon
- Sardines
- Mackerel
- Anchovies
- Other oily fish
- Fish oil
- Marine algae
- Flaxseed
- Chia seeds
What Does Omega-6 Do for Dogs and Cats?
Omega-6 sometimes gets a bad reputation because certain Omega-6-derived compounds participate in inflammatory pathways.
But that doesn't mean Omega-6 itself is unhealthy.
Omega-6 fatty acids are essential components of a healthy diet and play important roles throughout the body.
They contribute to:
- Healthy skin and coat
- Normal cell membrane structure
- Growth and reproduction
- Normal physiological functions
- Energy metabolism
Linoleic acid (LA) is one of the most important Omega-6 fatty acids in pet nutrition. Cats also have specific dietary requirements for arachidonic acid, which is naturally found in animal fats and tissues.
Where Does Omega-6 Come From?
Omega-6 fatty acids are widely available in common pet food ingredients.
Sources can include:
- Sunflower oil
- Soybean oil
- Corn oil
- Poultry fat
- Eggs
- Nuts
- Seeds
Because Omega-6 is present in many commonly used ingredients, typical diets often provide it more readily than marine-derived EPA and DHA.
This is one reason Omega-3 supplementation receives so much attention.
How to Choose Fish Oil for Dogs and Cats
Fish oil is one of the most convenient ways to provide EPA and DHA, but products can vary significantly in quality. When comparing fish oils, consider these factors:
1. Check the EPA + DHA content
Look for the actual amounts of EPA and DHA per serving rather than judging a product only by the total amount of fish oil.
2. Consider the form of fish oil
Fish oils may be available in forms such as ethyl ester (EE), triglyceride (TG), and re-esterified triglyceride (rTG).
Don't rely on the form alone to determine quality. Concentration, freshness, purity, stability, and appropriate dosing are also important.
3. Look at the fish source
Products made from smaller oily fish such as sardines and anchovies are commonly used as sources of EPA and DHA. Responsible sourcing and contaminant testing are more important than simply assuming that one species of fish is automatically safer than another.
4. Look for quality and contaminant testing
Reputable manufacturers should have appropriate quality-control measures for contaminants and oxidation. Independent testing programs such as IFOS (International Fish Oil Standards) evaluate participating fish oil products for factors including potency, contaminants, and oxidation. Third-party testing can provide additional information when you're comparing supplements.
5. Protect fish oil from oxidation
Omega-3 fatty acids are sensitive to heat, light, and oxygen. Follow the product's storage instructions carefully and pay attention to expiration dates. If an oil develops a noticeably rancid or unusual odor, don't continue using it.