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Fish oil for dogs: does your dog need it?

Fish oil is one of the most popular dog supplements — but not every dog needs a bottle. Here's what the omega-3s do, and when it's worth adding.

By Emma Hart · NatBuddy editorial
July 4, 2026 · 5 min read
Fish oil for dogs: does your dog need it?

Fish oil is one of the most popular supplements owners reach for, and for good reason — it's a source of the omega-3 fatty acids EPA and DHA. But popular doesn't mean every dog needs a bottle, so it's worth knowing what it actually does before you add it.

What the omega-3s do

EPA and DHA support skin and coat, and they're often discussed for joint comfort and general wellness; DHA also matters for a growing puppy's development. Many complete dog foods already include some omega-3, so a supplement is most useful when a dog needs more than the bowl provides — something your vet can help you judge.

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More is not better. Fish oil adds fat and calories, and very high doses can thin the blood and upset the stomach. Dose to your dog's weight on your vet's guidance rather than guessing, and don't reach for a human supplement without checking — some contain added vitamins that aren't safe at a dog's scale.

Choosing and storing it

If your vet does suggest one, pick a product made for pets from a reputable maker, and store it well — fish oil goes rancid with heat and light, so many people keep it in the fridge. Introduce it slowly and watch for any loose stool or a fishy-smelling coat, which usually just means the dose is a touch high.

Fish oil can be a genuinely useful add-on — but it's a dose-it-right, ask-your-vet supplement, not a free-for-all.

Food first, supplements second: a complete, balanced diet covers most dogs' needs, and extras are best added for a reason and with your vet's steer — especially if your dog has a health condition or is on medication. Informational only — always consult your vet for dietary decisions.

Common questions

Do dogs need fish oil?

Not all of them. Many complete diets already contain omega-3s. Fish oil is most useful when a dog needs extra — for skin, coat or joint support, for example — which your vet can help you decide.

How much fish oil should I give my dog?

It depends on your dog's weight and the product's concentration, so dose on your vet's guidance. Too much adds calories and, at high levels, can thin the blood or upset the stomach.

Can I give my dog human fish oil?

Check with your vet first. Plain fish oil may be fine, but some human supplements include added vitamins that aren't safe at a dog's dose. A pet-formulated product is the safer default.

What are the side effects of fish oil in dogs?

Usually mild — loose stool, a fishy odor, or weight gain from the extra calories. High doses can affect blood clotting, which is another reason to dose carefully and involve your vet.

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Guidance on this page is grounded in established veterinary-nutrition and animal-health authorities.

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Emma Hart

Dog nutrition writer · NatBuddy

Emma Hart writes NatBuddy's dog-nutrition guides — the food-safety explainers, feeding math, and homemade recipes you'll find on this blog. She isn't a veterinarian, and nothing she writes replaces yours.

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Emma Hart is the byline for NatBuddy's editorial work — the writing, research and editing behind our nutrition content. She is not a veterinarian. For anything specific to your dog's health, talk to your vet. See our Vet Disclaimer.

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