Omega-3 is one of those nutrients you will often hear about when it comes to supporting your dog's overall well-being.
But what exactly is omega-3, why is it important, and does the source of omega-3 actually matter?
The short answer is yes — the source matters.
What is Omega-3?
Omega-3 is a family of essential polyunsaturated fatty acids. The three you are most likely to come across are ALA, EPA and DHA.
EPA and DHA are the long-chain omega-3 fatty acids that have been most closely studied for their roles in supporting normal inflammatory processes, skin and coat health, cardiovascular health, brain function and joint health.
Dogs can convert some ALA, which is found in plant foods such as flaxseed, into longer-chain omega-3s. However, this conversion is limited, particularly when it comes to producing DHA.
This is why marine sources of preformed EPA and DHA are generally considered a more reliable way of providing these important fatty acids.
So, where can my dog get Omega-3?
If you want to include omega-3 as part of your dog's whole-food diet, oily fish can be a fantastic option.
Sardines, mackerel and salmon are all naturally rich in EPA and DHA. Fresh, frozen or canned fish can all be options, provided they are appropriate for dogs and prepared without added salt, sauces or other ingredients that aren't suitable for them.
Green-lipped mussels are another interesting whole-food source. They provide EPA and DHA along with other marine fatty acids, including ETA, which may contribute to their anti-inflammatory properties.
And of course, not every dog enjoys fish, and not every household has access to suitable fresh fish.
That's where supplementation can be useful.
What should I look for in a fish oil?
If you choose a fish oil supplement, don't just look at the amount of “fish oil” in the bottle.
Look at the actual EPA and DHA content.
Two products can contain the same amount of fish oil but provide very different amounts of EPA and DHA.
Quality and freshness matter too.
Omega-3-rich oils are particularly vulnerable to oxidation when exposed to oxygen, heat and light. Once an oil has oxidised, it is no longer the fresh source of omega-3 you intended to give your dog.
When choosing an oil, look for:
- A clearly stated EPA and DHA amount
- Good quality packaging that limits exposure to light and air
- A reputable manufacturer with appropriate quality testing
- A suitable expiry date
- Storage instructions that you can realistically follow
Once opened, follow the manufacturer's storage instructions and keep the oil protected from heat and light. Refrigeration is often a good option for liquid oils, but always check the product's specific recommendations.
And if your fish oil suddenly develops a strong, unpleasant or rancid smell, that's a pretty good sign that it is time to replace it.
What about krill oil?
Krill oil is another marine source of EPA and DHA.
One of the interesting things about krill is that its omega-3s are largely associated with phospholipids, and krill naturally contains the antioxidant astaxanthin.
Krill oil can therefore be an excellent source of omega-3, but there is a trade-off.
Krill oil generally contains less EPA and DHA per gram than many concentrated fish oils. This means you may need more of the product to provide the same amount of EPA and DHA, which can make it a more expensive option.
So while krill is certainly worth considering, it isn't automatically “better” than fish oil.
What about algae oil?
Algae oil is an interesting option, particularly if you are looking for a non-fish source of marine omega-3.
Some algae oils provide DHA, while others provide both DHA and EPA, so it's important to check the label rather than assuming they all provide the same thing.
Algae is also the original source of the DHA that accumulates in fish further up the marine food chain, making algae-derived omega-3 an appealing option for people looking for alternatives to traditional fish oils.
If sustainability is important to you, algae oil can be worth considering — although environmental impact depends on how the algae is grown, harvested and processed.
And what about flaxseed and hemp oil?
This is where things get a little confusing.
Flaxseed is an excellent source of ALA, a plant-based omega-3 fatty acid.
Dogs can convert some ALA into EPA, but conversion to DHA is limited. Research in dogs has found that marine sources of preformed EPA and DHA are much more effective at increasing circulating and membrane levels of these long-chain omega-3s than flaxseed.
That doesn't make flaxseed a “bad” food.
Whole or ground flaxseed can provide fibre and other nutrients, and ALA is still an important dietary fatty acid.
But if your specific goal is to provide your dog with EPA and DHA, I'd look to marine sources rather than relying on flaxseed oil.
Hemp seed oil is another interesting plant oil. It contains ALA as well as other fatty acids, including GLA, and can be useful as part of a balanced diet.
But again, if you're looking specifically for EPA and DHA, hemp oil isn't the source I'd choose.
Why do we like powdered whole-food omega-3 sources?
This is where things get really interesting.
Instead of always reaching for an oil, there are also whole-food marine sources that provide omega-3 in their natural food matrix.
Green-lipped mussel powder
Green-lipped mussel is one of our favourite whole-food omega-3 sources.
It provides EPA and DHA as well as other marine fatty acids, including ETA.
It also naturally contains compounds such as glycosaminoglycans, including chondroitin-like compounds, which are associated with normal cartilage and joint structure.
So rather than thinking of green-lipped mussel as simply another source of EPA and DHA, we like it because it provides a broader range of naturally occurring marine nutrients.
Fish roe powder
Fish roe is another fascinating whole-food source of omega-3.
Because DHA is important for normal brain and eye development, DHA-rich foods are particularly interesting during puppyhood and throughout a dog's life.
Fish roe also provides omega-3 in phospholipid-containing forms, along with other nutrients naturally present in the roe.
This makes fish roe a very interesting addition when you're looking for whole-food sources of marine omega-3 rather than simply an isolated oil.
So, which Omega-3 is best?
Honestly?
There isn't one answer that is best for every dog.
Fish oil can be a convenient and concentrated source of EPA and DHA.
Krill oil provides EPA and DHA alongside phospholipids and astaxanthin.
Algae oil can provide marine omega-3 without using fish as the direct source.
Green-lipped mussel provides a broader range of naturally occurring marine compounds alongside omega-3.
Fish roe provides DHA-rich, phospholipid-containing omega-3 along with the other nutrients naturally found in the whole food.
And whole foods such as oily fish can provide omega-3 as part of the dog's overall diet.
The important thing is to look beyond the words “Omega-3” on the front of the packet and consider which omega-3 fatty acids are actually present, how much EPA and DHA you're providing, the quality and freshness of the product, and what makes sense for your individual dog.
What works for us?
We like variety.
Our dogs get whole oily fish as part of their diet when suitable, and we also use SEWA Dog Boost with their breakfast.
SEWA Dog Boost combines green-lipped mussel and fish roe powders, giving us a convenient way to include these whole-food marine ingredients in their everyday routine.
It's not about finding one magical source of omega-3.
It's about choosing good-quality sources and finding an approach that works for you, your dog and the rest of their diet.
Because, as with so many things in nutrition, there isn't always one “best” option — sometimes it's about finding the right option for your dog.