Omega-3 fatty acids can help a dog’s skin, coat, joints and more, but only when the label shows enough EPA and DHA, the two fish-derived omega-3s that do the work. Many healthy dogs on a complete and balanced diet do not need extra oil at all. Dogs with itchy skin, stiff joints or another diagnosed condition are the ones where your vet may suggest it, and then the dose depends on your dog’s weight and diagnosis. Here is how to tell which group your dog is in, what to look for on a label, and where food fits in.
TL;DR
- EPA and DHA are the omega-3s that matter most for dogs. Flaxseed (ALA) is a different omega-3, and dogs convert it to EPA and DHA poorly.
- A complete and balanced diet usually prevents deficiency, so extra omega-3 is typically a targeted choice made with your vet, not a default.
- Check the combined EPA plus DHA per serving on the label, not the bottle size or a “high omega-3” claim.
- Vets use higher, weight-based doses for arthritis and itchy skin. Never copy those numbers without your vet, especially if your dog takes medication or has had pancreatitis.
- Food can be a gentle way to add marine omega-3. Our Turkey + Salmon freeze-dried recipe includes salmon for that reason.
Table of Contents
- What omega-3s do for dogs
- Does your dog need extra omega-3?
- How much omega-3 for dogs?
- Reading a label: what to check
- Fish oil vs. whole-fish dog food
- Safety: when to call your vet first
- Our perspective at Loyal Saints
- Bringing omega-rich food into your dog’s bowl
- A simple plan to get started
- FAQ
- Sources
What omega-3s do for dogs
Omega-3s are fats that dogs need to get from food. Three matter here:
- EPA (eicosapentaenoic acid): linked to a calmer inflammatory response, which is why vets look at it for joints and skin.
- DHA (docosahexaenoic acid): important for brain and eye development in puppies, and it has its own roles in adults.
- ALA (alpha-linolenic acid): the plant omega-3 in flaxseed.
So when someone asks whether DHA is the same as omega-3, the answer is no. DHA is one omega-3 among several. The AVMA literature notes that EPA and DHA have separate effects as well as overlapping ones, which is why a label that lists only “total omega-3” or only DHA doesn’t tell you the full picture.
Benefits vets actually discuss
VCA Animal Hospitals describes fish oil as rich in EPA and DHA from cold-water fish such as salmon, and veterinary sources point to several areas where it is used:
- Skin and coat: as support for dogs with atopic dermatitis and other inflammatory skin disease.
- Joints: as part of managing osteoarthritis, where a diet rich in EPA and DHA can help modulate inflammation.
- Kidney, heart and gut: as an add-on in some cases of kidney disease, heart disease and inflammatory bowel disease, with evidence and dosing that differ by diagnosis.
Honest caveat: the strength of evidence varies a lot. UC Davis’s veterinary supplement experts stress that owner testimonials and human or lab studies are not proof for dogs. What counts is evidence for the exact product, dose and condition. Even in cancer care, a UC Davis specialist notes that evidence is limited and conflicting for many nutrition strategies, with calories and a balanced diet as the main goals.
Does your dog need extra omega-3?
Often the answer is no. The Merck Veterinary Manual says essential fatty acid deficiency is extremely rare in dogs fed a properly preserved, complete and balanced diet. A deficiency can show up as a dry, scaly, dull coat and low activity, but those signs also overlap with metabolic disease, so a vet visit comes before a new bottle.
For reference, AAFCO has no minimum EPA or DHA for adult maintenance diets. It does recommend 0.05% combined EPA and DHA on a dry-matter basis for growth and reproduction, a figure the FDA also cites in a 2020 notice.
Extra omega-3 is more often considered when your dog has:
- Persistent itching, recurrent ear or skin flare-ups, or a diagnosed allergy
- Stiffness, slowing down on walks or a diagnosis of osteoarthritis
- Kidney, heart or digestive disease managed by your vet
If your dog is itching, omega-3 should support the work-up, not replace it. Merck notes that no particular formulation, ratio or dose has proven best for skin, coat and itching in every dog, and allergies, infections and parasites all need their own answers.
How much omega-3 for dogs?
There is no single safe number for every dog. The doses in veterinary references are therapeutic ranges for specific diagnoses, and they are written in milligrams of EPA or of EPA plus DHA, not milligrams of fish oil.
| Situation | Published range | Notes |
|---|---|---|
| Osteoarthritis | 50 to 100 mg/kg EPA by mouth every 24 hours | Expressed as EPA only, not total oil |
| Atopic dermatitis | 65 to 90 mg/kg EPA and DHA every 24 hours | Response varies from dog to dog |
| Healthy dog on a complete diet | Usually no added dose needed | Ask your vet first |
A worked example
Say your dog weighs 44 lb, which is 20 kg. For the skin range above, the arithmetic is 20 kg × 65 mg = 1,300 mg and 20 kg × 90 mg = 1,800 mg of combined EPA and DHA per day. That total counts everything your dog eats: the omega-3 in food plus any supplement.
This is arithmetic to help you read a label, not a prescription. Your vet should set the plan, because the right dose depends on the diagnosis. Our guides on how to calculate omega-3 dosage for dogs and EPA and DHA dosage for allergy relief walk through the math in more detail.
Reading a label: what to check
VCA’s practical message is that results depend on reaching enough EPA and DHA. It also notes that many over-the-counter foods and supplements don’t supply enough to produce a clinical effect. So skip the front of the bottle and flip it over.
- Find EPA and DHA in milligrams per serving. Add them together. A bare “1,000 mg fish oil” tells you very little.
- Note the source. Marine fish, krill and algae oils provide EPA and DHA directly. Flaxseed provides ALA, which dogs convert to EPA and DHA inefficiently.
- Look for transparency and testing. VCA points out that pet supplements aren’t held to the same premarket standards as approved medications, and labels can be inaccurate or contaminated. It advises independent quality testing when available and a manufacturer who will share safety and efficacy information.
- Check recalls. In 2023 a company recalled omega-3 supplements for cats and dogs over possible elevated vitamin A.
- Add up the total. Count EPA and DHA from the food, treats and every supplement.
If you’re comparing prices on supplements and food, a roundup of online pet supply stores can help you shop around, but price should come after the EPA and DHA numbers.
What about vitamin E?
Some fish oils include vitamin E, and some owners ask whether it’s required. It isn’t automatically. VCA describes vitamin E as an antioxidant used for specific deficiencies and diseases, so check the exact form and amount on the Supplement Facts panel and don’t add it casually on top.
Fish oil vs. whole-fish dog food
This is the question behind “best omega-3 source for dogs.” Here is how the options compare.
| Source | What it gives | Watch for |
|---|---|---|
| Fish oil (liquid or capsule) | Concentrated EPA and DHA, easy to dose | Potency varies, oil can oxidize, check recalls and labels |
| Krill or algae oil | Marine EPA and DHA from other sources | Same label checks; amounts differ |
| Flaxseed | ALA only | Poor conversion to EPA and DHA |
| Whole-fish food (such as salmon recipes) | Omega-3s inside a complete meal | Amount per serving is lower than a therapeutic dose |
Fish oil is the tool when your vet wants a specific, measured dose. A food that includes salmon is a gentler everyday way to bring marine omega-3 into the bowl, and it means one fewer thing to measure. The two can work together, as long as your vet knows the total.
Safety: when to call your vet first
“Natural” isn’t the same as risk-free. VCA lists possible stomach upset, abnormal bruising, pancreatitis, appetite loss and allergic reactions with fish oil. Talk to your vet before starting if your dog has any of these:
- A history of pancreatitis, diarrhea or diabetes
- A clotting disorder, or takes anticoagulants, NSAIDs or chemotherapy drugs
- Pregnancy or nursing
- Known allergies
Introduce any new oil with food. Stop and call your vet for vomiting, persistent diarrhea, unusual bruising, facial swelling, breathing changes or marked lethargy. For kidney disease, omega-3 is an add-on to a vet-designed diet, not a replacement for managing protein, phosphorus, sodium and blood pressure, as Merck’s glomerular disease guidance describes.
Our perspective at Loyal Saints
We started Loyal Saints as dog moms who wanted food we’d feel good about serving to a family member. When it comes to omega-3, we think the best approach is food first, supplements second, and your vet in the loop for both.
That’s why our Turkey + Salmon recipe pairs lean turkey with salmon. Salmon is a natural source of EPA and DHA, and the recipe is human-grade, AAFCO-complete and freeze-dried, so there’s no fridge, thawing or ice packs. We don’t present it as a replacement for the individualized dose a vet might set for a dog with arthritis or a skin condition. Think of it as a steady, whole-food foundation that you can add to if your vet advises.
We also want you to feel in charge of the numbers. Ask any brand, ours included, how much EPA and DHA is in a serving, and expect a straight answer. You can read more in our omega-3 guide and on our EPA and DHA page, or see how we think about fish oils for dogs. If you’re dealing with a specific issue, our posts on arthritis and dermatitis go deeper.
— Kristina
Bringing omega-rich food into your dog’s bowl
If you’d like to try a salmon-forward meal, start with Freeze Dried Raw Turkey with Salmon in the 5 oz bag, or try all three recipes in the 5 oz Variety Pack (Beef, Chicken, and Turkey with Salmon). Prices range from $24.95 to $44.95 depending on the size and recipe. Larger households can look at the 14 oz Variety Pack.
Standard shipping is $7.99 and express is $14.99, with details on our shipping page. If you plan to feed us regularly, the Halo Club membership is $79.99 per year or $10.99 per month and includes savings and shipping perks.
Switch foods gradually, and tell your vet about the change, especially if your dog is already taking fish oil.
A simple plan to get started
- Book a check-up if your dog is itchy, stiff or slowing down, so the cause is identified.
- Ask your vet whether omega-3 makes sense, what daily EPA and DHA total to aim for, and what your dog’s medications mean for safety.
- Add up what your dog already gets from food and treats.
- Choose a source with transparent EPA and DHA amounts, whether that’s a measured oil, a salmon-based meal or both.
- Start slowly with food, watch stools and appetite, and re-check with your vet after a few weeks.
Those tail wags are worth the patience. Results vary from dog to dog, and skin and joint changes take time, so keep notes on itching, mobility and energy to share at your next visit.
FAQ
Can I give my dog human fish oil?
Sometimes, but ask your vet first. Human products can have different potency, added ingredients, or amounts that don’t suit a dog’s weight. Check the EPA and DHA per serving, and tell your vet about any medications your dog takes.
Is flaxseed oil a good substitute for fish oil?
Not really. Flaxseed provides ALA, and dogs convert it to EPA and DHA inefficiently. Marine fish, krill and algae oils supply EPA and DHA directly, which is why they’re usually preferred for targeted use.
Can omega-3 cure my dog’s allergies?
No. It may help support skin and coat, but response varies and itching can come from allergies, infections or parasites. Use omega-3 alongside the diagnosis and treatment plan your vet creates.
How long until I see results?
That depends on the dog and the reason you’re using it. Skin and joint changes usually aren’t overnight, so track symptoms and review progress with your vet instead of expecting a quick fix.
Sources
- Fish Oil, VCA Animal Hospitals
- Arthritis and Nutrition for Dogs, VCA Animal Hospitals
- Nutraceuticals, VCA Animal Hospitals
- Vitamin E and Selenium, VCA Animal Hospitals
- Nutritional Requirements of Small Animals, Merck Veterinary Manual
- Osteoarthritis in Dogs and Cats, Merck Veterinary Manual
- Atopic dermatitis therapeutic agents, Merck Veterinary Manual
- Glomerular Disease in Dogs and Cats, Merck Veterinary Manual
- The essential nature of dietary omega-3 fatty acids in dogs, JAVMA
- FDA CVM GRAS Notice No Questions Letter
- FDA recall of omega-3 supplements for cats and dogs
- Fish Oil Dosing in Pet Diets and Supplements, Today’s Veterinary Practice
- UC Davis Center for Companion Animal Health
- Nutritional management of patients with cancer, UC Davis
- The 5 Best Pet Supply Stores Online
