It’s easy to assume seasonal shifts or stress. But one of the most common and most overlooked reasons a dog’s coat, skin, and joints start showing wear is a consistent shortfall in omega-3 fatty acids, fats the body cannot produce on its own and must get entirely through food or supplementation.
What Omega-3s Actually Do in the Body
Omega-3 fatty acids are not just one thing. There are three main types relevant to dogs: EPA (eicosapentaenoic acid), DHA (docosahexaenoic acid), and ALA (alpha-linolenic acid). Each one plays a distinct role.
EPA and DHA are the biologically active forms. They are incorporated directly into cell membranes throughout the body, including in skin cells, joint tissue, brain cells, and the lining of blood vessels. Once built into those membranes, they compete with pro-inflammatory omega-6 fatty acids. When omega-3s have the upper hand, the body produces fewer pro-inflammatory compounds and more of the signaling molecules that help resolve inflammation naturally.
DHA is also a structural component of the brain and retina. It plays a key role in cognitive development, visual acuity, and neurological function. For puppies, it is considered particularly important during the developmental window when the brain is still forming.
ALA, the plant-derived form found in flaxseed and similar sources, is different. The body can convert some ALA into EPA and DHA, but the conversion rate in dogs is highly limited. Research comparing flaxseed oil supplementation to preformed marine omega-3s in dogs found that flaxseed oil raised only ALA levels, with no meaningful increase in circulating EPA or DHA, while marine sources produced clear measurable increases [1]. ALA still contributes meaningful nutritional value, but EPA and DHA from marine sources deliver more direct biological impact.
The ratio of omega-3s to omega-6s in a dog’s diet matters more than either number in isolation. Most commercial dog foods are formulated with a heavy omega-6 load, largely because the animal proteins and plant oils used in kibble production are high in omega-6s. When omega-6 intake is consistently much higher than omega-3s, the inflammatory pathways in the body can become more active than the anti-inflammatory ones, and that imbalance tends to show up over time.
The Signs Worth Paying Attention To
No single symptom confirms a shortfall in these fats. But certain patterns, especially when they appear together, are worth taking seriously.
Dull, dry, or coarse coat. A healthy coat has a natural sheen because skin cells produce oils that coat each hair shaft. When cell membranes in skin tissue are depleted of these fatty acids, the quality of those oils changes. The coat loses its luster and can feel rough or brittle to the touch. Research in dogs has shown that EPA and DHA supplementation leads to measurable improvements in hair shaft lipid content and coat quality with consistent daily use [2].
Dry, flaky skin. Skin cells rely on fatty acids to maintain their protective barrier. Without adequate omega-3 intake, that barrier becomes more permeable, and moisture escapes more easily, leaving the skin dry, itchy, or prone to flaking. Dietary causes are common here and worth considering before jumping to conclusions about allergies.
Persistent itching or scratching. Scratching without an obvious cause, no fleas, no known allergen, no skin infection, can reflect underlying low-level inflammation in the skin. EPA may help support a normal inflammatory response in skin tissue. If scratching is significant or the skin appears red and irritated, a vet visit is appropriate.
Joint stiffness, especially in older or large-breed dogs. EPA and DHA may help limit the production of prostaglandin E2 in cartilage and reduce matrix metalloproteinase activity, the enzymes primarily involved in cartilage breakdown [3]. A dog that seems stiffer than usual after rest, or slower to warm up on morning walks, may be experiencing joint discomfort tied in part to an inflammatory imbalance. Other causes are always possible, and a veterinarian’s evaluation matters here.
Reduced energy or cognitive changes in older dogs. DHA supports brain cell function throughout a dog’s life. In senior dogs, lower intake may contribute to dullness, reduced engagement, or slower responses, though these signs have many possible explanations and warrant a full vet workup if they develop.
Slow healing or persistent low-grade infections. The immune system’s ability to mount and resolve an appropriate response is tied to cellular health. Minor skin issues, ear irritation, or wounds that seem to linger can sometimes reflect a nutritional baseline that is not supporting the immune system as fully as it could.
These signs do not all require a nutritional gap to explain them. Many have overlapping causes. The value of recognizing the pattern is that it gives you somewhere useful to start.
Why Most Dogs Come Up Short
The honest answer is that the vast majority of commercial dog foods do not deliver meaningful levels of EPA or DHA.
Kibble production involves heat processing at temperatures typically ranging from 160 to 200 degrees Celsius. Research on extrusion processing has found that these temperatures can markedly decrease concentrations of essential fatty acids, including omega-3s, and that even when fish oil is included in a formula, a significant portion may be oxidized during processing or storage [4]. The declared amount on a label reflects what was added, not necessarily what survives through manufacturing and time on the shelf.
Fresh and raw diets generally preserve these fatty acids better, particularly when they include oily fish or are formulated with quality sources of these fats. Dogs on those diets may fare better, though sourcing still matters significantly.
The other piece is proportion. Even if a food contains some of these fats, the ratio to omega-6 may still be tilted far enough toward the inflammatory side that the body’s net experience is one of chronic low-grade imbalance.
How Diet Affects the Omega-3 Picture
Diet can play a big role in a dog’s inflammatory baseline because what a dog eats directly affects the composition of their cell membranes. Every time a dog eats, the body draws from available nutrients to build and repair tissue. If the diet consistently supplies more omega-6s than omega-3s, cell membranes across the body gradually reflect that imbalance.
This connects to gut health in ways that are easy to miss. The digestive tract is closely connected to the immune system. When the gut is out of balance, from poor-quality fats, highly processed ingredients, or a disrupted microbiome, the immune system can become more reactive. Over time, that reactivity often shows up as itchy skin, recurring ear problems, loose stool, or joint discomfort. Supporting both the fat balance and the digestive environment tends to be more effective than addressing either one alone.
Whether you feed kibble, raw, or home-cooked meals, the fat profile of the diet shapes what the body has to work with. Adding oily fish like sardines, mackerel, or herring a few times a week can meaningfully shift the omega-3 intake for some dogs. Quality sourcing matters, and the same principle that applies to raw feeding applies to any protein or fat addition.
What to Look for in a Supplement
If dietary sources do not cover the gap, a premium dog supplement can help bridge it. A few things are worth understanding before choosing one.
Source matters. EPA and DHA from marine sources, including fish oil, anchovy oil, algal oil, or green-lipped mussel, are biologically available in a way that ALA from plant sources is not [1]. That does not make plant-based ALA useless. It means that if EPA and DHA are the primary goals, marine sources deliver them more directly.
Algal oil is a particularly interesting option because it is the original biosynthetic source of the omega-3s that accumulate in fish. Fish become rich in EPA and DHA by consuming algae, directly or through the food chain. Algal oil provides those same fatty acids without the fish intermediary, making it a concentrated and sustainable source.
Green-lipped mussel provides a unique fatty acid profile that includes certain fatty acids not found in standard fish oils. It has been studied in the context of joint comfort and mobility and may offer complementary benefits alongside conventional fish oil sources.
One thing that does not get enough attention: fish oils go rancid faster than most dog parents realize. A supplement stored improperly or used past its window may deliver little to no benefit, and oxidized oil may actually increase cellular stress rather than reduce it [5]. Fresh smell, dark storage, and a reasonable use-by window all matter.
Absorption is not automatic. Omega-3s are fat-soluble nutrients. A dog whose digestive system is not absorbing fats efficiently, due to enzyme deficiency, gut dysbiosis, or poor general digestive health, may not be extracting much value from a supplement even when intake looks adequate on paper. This is why digestive health can directly influence whether supplementation actually reaches the cells that need it.
The Right Omega-3 Formula for Dogs
Bernie’s OMG! Omegas Chews was built specifically around what makes a marine omega-3 supplement effective for dogs: verified EPA and DHA amounts, clean sourcing from low-contaminant marine species, and natural antioxidant protection to guard against oxidation. Each 3g soft chew delivers a minimum of 140 mg EPA and 125 mg DHA from anchovy oil and marine microalgal oil. Natural vitamin E (52 IU per chew) and green tea extract (20 mg per chew) support bioavailability and protect the fatty acids from degrading before they reach the cells that need them. The formula is molecularly distilled, made in the USA at GMP and SQF certified facilities, and free from artificial colors, flavors, and PFAS packaging.
Dosing scales by weight: one chew daily for dogs up to 25 pounds, two for 26 to 50 pounds, three for 51 to 75 pounds, four for 76 to 100 pounds, and five for dogs over 100 pounds. The chews come in pork or salmon flavoring.
A liquid format, Bernie’s OMG! Omega Oil, is also available for dog parents who prefer mixing a supplement directly into food. The oil uses marine microalgal oil and wild Alaskan pollock oil as its primary EPA and DHA sources, with grape seed oil and natural vitamin E for absorption support. It has no strong fishy odor and is appropriate for dogs of any breed or age.
For dogs whose primary concern is gut balance and digestive health, Bernie’s Perfect Poop supports the intestinal environment that makes any fat-soluble nutrient, including EPA and DHA, more effectively absorbed. The formula includes fiber from Miscanthus grass grown in Missouri and Arkansas, inulin, and spore-forming probiotics Bacillus Subtilis and Bacillus Coagulans that survive stomach acid and reach the intestines intact, alongside a blend of digestive enzymes, including lipase for direct fat breakdown support. Bernie’s Perfect Poop has been used by and has supported digestive wellness for millions of dogs. It comes as grass bits rather than powder, in natural cheddar or chicken flavor, and is grain-free and gluten-free.
What to Do If You Suspect a Gap
The most practical first step is an honest look at your dog’s current diet. Check the ingredient list and guaranteed analysis on the food packaging. If fish, fish meal, or fish oil does not appear in the top several ingredients, or if the food is primarily grain-free and plant-based, your dog’s EPA and DHA intake may be lower than ideal.
A conversation with your veterinarian is worthwhile, particularly if signs like joint stiffness, persistent skin issues, or changes in cognitive engagement are present. Some veterinarians can run bloodwork panels that include fatty acid profiles, though these are not universally standard. The clinical picture, diet history, and the dog’s condition all contribute to a clearer assessment.
Adding a quality omega-3 source is generally considered safe for most healthy adult dogs at appropriate amounts [5]. Dogs on blood-thinning medications or with specific health conditions should have any supplementation discussed with a vet first.
Ready to Fill the Gap?
Bernie’s OMG! Omegas delivers EPA and DHA from clean marine sources in soft chews or concentrated oil that your dog will actually eat. For dog parents who want to support gut health alongside omega-3 status, Bernie’s Perfect Poop delivers fiber, prebiotics, probiotics, and enzymes in grass bits that mix right into any meal. Every bag and bottle comes with the Growl-Free Guarantee. Try it risk-free and see what the right nutritional foundation can do.
Frequently Asked Questions
Can a dog be omega-3 deficient even on a high-quality kibble?
Yes. Most commercial dog foods, including premium formulas, are produced through heat processing that can degrade omega-3 fatty acids [4]. Even when fish oil or fish meal is listed on the label, the content surviving processing and storage may be meaningfully lower than expected. A dry food diet alone is generally not a reliable source of adequate EPA and DHA for most dogs.
How long does it take to see changes after adding omega-3s?
There is no universal timeline. Some dog parents notice coat and skin changes within several weeks of consistent supplementation, while others may take longer [2]. Factors like age, digestive health, and the dog’s nutritional baseline all affect the outcome. Consistency tends to matter more than any specific expectation about timing.
Are plant-based omega-3s like flaxseed enough for dogs?
Flaxseed and other plant sources provide ALA, which the body can convert to EPA and DHA to some degree. However, the conversion rate in dogs is highly limited, and research has shown that flaxseed oil supplementation does not produce meaningful increases in circulating EPA or DHA in dogs [1]. ALA contributes meaningfully to the diet, but for dogs where joint comfort, skin integrity, or immune support are the focus, marine sources tend to be more effective. For dogs with fish sensitivities, algal oil provides EPA and DHA without the fish protein.
Can a dog get too much omega-3?
Excessive intake is possible, though uncommon at typical supplemental doses. Very high amounts may affect platelet function, which matters for dogs with bleeding disorders or those on anticoagulant medications [5]. For most healthy adult dogs, a well-formulated supplement at the recommended dose is considered safe. Dogs with specific health conditions should have any supplementation confirmed with a veterinarian before starting.
Does omega-3 supplementation help with dog allergies?
EPA and DHA may help support a normal inflammatory response in dogs with environmental or food sensitivities. They do not address the underlying trigger, but supporting skin barrier integrity and moderating immune reactivity through nutrition can complement other allergy management strategies. A vet evaluation is worthwhile for dogs with ongoing allergy symptoms to identify the root cause alongside any dietary adjustments.
SOURCES
[1] Dominguez TE, Kalinowski CR, Suchodolski J, et al. “Enhanced omega-3 index after long- versus short-chain omega-3 fatty acid supplementation in dogs.” Veterinary Medicine and Science. 2021;7(3):819-828. PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC8025612/ – canine study confirming flaxseed oil raised only ALA with no meaningful EPA or DHA increase; preformed marine sources produced significant measurable increases. Applied to ALA conversion claims and FAQ.
[2] Guillot M, Serisier S, Lavelle R, et al. “A prospective, randomized, double blind, placebo-controlled evaluation of the effects of an n-3 essential fatty acids supplement on clinical signs, and fatty acid concentrations in the erythrocyte membrane, hair shafts and skin surface of dogs with poor quality coats.” Veterinary Dermatology. 2020. https://www.sciencedirect.com/science/article/pii/S0952327820300983 – randomized placebo-controlled trial in 24 dogs; clinical coat scores improved significantly from day 60; lipid content in hair shafts increased progressively in supplemented group. Applied to coat/skin section and FAQ.
[3] Henrotin Y, et al. “Nutrition and nutraceuticals in the changing management of osteoarthritis for dogs and cats.” Journal of the American Veterinary Medical Association. 2020;256(12). https://avmajournals.avma.org/view/journals/javma/256/12/javma.256.12.1335.xml – confirms EPA and DHA reduce prostaglandin E2 in cartilage and suppress matrix metalloproteinase expression. Applied to joint stiffness section.
[4] Tran QD, Hendriks WH, van der Poel AFB. “Effects of extrusion processing on nutrients in dry pet food.” Journal of the Science of Food and Agriculture. 2008;88(9). Referenced in: https://www.purepetfood.com/blog/we-proved-the-way-conventional-pet-foods-are-processed-adversely-affects-their-nutritional-value-the-kibble-wars – research indicates extrusion at 160-200°C markedly decreases concentrations of linolenic (omega-3) and linoleic (omega-6) essential fatty acids, increasing oleic acid as a marker of lipid oxidation. Applied to kibble processing section and FAQ. Note: the original claim should be presented as “research suggests” or “research indicates” as kibble formulations vary and some manufacturers add omega-3s post-processing.
[5] Lenox CE, Bauer JE. “Potential adverse effects of omega-3 fatty acids in dogs and cats.” Journal of Veterinary Internal Medicine. 2013;27(2):217-226. PubMed: https://pubmed.ncbi.nlm.nih.gov/23323770/ – documents rancid oil oxidative stress risk, high-dose platelet effects, and safety considerations. Applied to oxidation/rancidity claim in supplement section, general safety guidance, and FAQ.
