Fish oil for dogs: liquid vs softgel vs chews

By the PetFishOilGuide editorial team · Updated October 13, 2026 · How we compare

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For fish oil for dogs, liquids are usually the most concentrated and the easiest to scale to a dog's size. Softgels are easy to count but fixed in strength. Chews are the easiest to give, but the EPA and DHA per piece varies widely, and many makers publish no numbers.

Choosing between liquid, softgel and chew fish oil for dogs is mostly a trade between convenience and concentration. All three can supply EPA and DHA. What differs is how much each serving holds and how well your dog takes it.

How much EPA and DHA does each form give?

Using manufacturer label data from our catalog, here are examples of each form:

• Liquid: Nutramax Welactin Advanced 3TA Omega-3 Liquid (8 fl oz) gives 880 mg EPA+DHA in a 2 mL serving. Iceland Pure Premier Omega Oil for Large Dog Breeds (17 fl oz) gives 2,614.2 mg per teaspoon.
• Softgel: Nutri-Vet Fish Oil Softgels for Dogs gives 300 mg per softgel, and Nutramax Welactin Canine Softgels (120 ct) gives 255 mg.
• Chew: Stratford Animal Health (Swedencare) Omega 3 Soft Chews (large and giant dogs) gives 900 mg per chew, and Nutramax Welactin Canine Soft Chews (60 ct) gives 255 mg. Several other chews publish numbers too, and the spread is wide.

So a single teaspoon of Iceland Pure Premier Omega Oil for Large Dog Breeds (17 fl oz) carries 2,614.2 mg, while a softgel carries a few hundred and the chews we list carry from about 105 to 900 mg each. That gap shows up when you work out what a large dog needs. Serving sizes differ, so always compare EPA and DHA, not "per serving" by itself.

Liquid fish oil for dogs

Liquids come in a bottle with a pump or a teaspoon measure. The per-mL figures give a fair comparison between brands.

Label data from manufacturer websites and published label text, checked October 13, 2026. How we compare.

Pros:

• Often the highest EPA and DHA per serving.
• Easy to adjust for a dog's weight, which helps small and large dogs.
• Mixes into food.

Cons:

• Smell and mess. Some dogs refuse food that smells strongly of fish.
• Measuring takes care, and pumps vary in volume per pump.
• Once opened, the oil is exposed to air each time.

Fish oil softgels for dogs

Softgels are capsules of oil. Some dogs take them whole in a treat, and some owners puncture them to squeeze the oil onto food.

Label data from manufacturer websites and published label text, checked October 13, 2026. How we compare.

Pros:

• No measuring, and the strength per capsule is printed.
• Less smell, and the oil is sealed until you use it.
• Large counts, such as 250 softgels in Strawfield Pets 1000 mg Omega 3 Softgels (250 ct), can last a while for a small dog.

Cons:

• Fixed strength: a small dog may need a fraction of a softgel, a large dog several.
• The headline "1000 mg" on some bottles is oil weight. That product lists 300 mg EPA+DHA per softgel.
• Some dogs will not swallow them.

Fish oil chews for dogs

Soft chews are the easiest to give to picky dogs, because they taste like a treat. For some chews in our catalog we could not find EPA and DHA on the maker's site, so the table below shows every chew in the catalog, including those with no numbers.

Label data from manufacturer websites and published label text, checked October 13, 2026. How we compare.

Pros:

• Dogs often take them like a treat.
• No measuring.

Cons:

• Most chews with published numbers give less EPA and DHA per piece than a teaspoon of liquid, and the amount varies a lot between chews. To reach the same amount a large dog may need several chews.
• Extra ingredients. Chews contain binders and flavors, which matters for dogs on restricted diets.
• Many makers publish no EPA and DHA at all, so you cannot work out a dose.

Chews with no published numbers:

• NaturVet Omega-Gold Soft Chews Plus Salmon Oil (dogs and cats): we could not read the maker's page; the only EPA and DHA figures we saw came from retailers (checked 2026-10-13) (checked October 13, 2026), so we cannot rank it.
• Pet Honesty Omega-3 Fish Oil Skin Health Chews (90 ct): we could not find EPA and DHA amounts on the maker's website (checked 2026-10-13) (checked October 13, 2026), so we cannot rank it.
• Zesty Paws Omega Bites Soft Chews, Bacon (90 ct): the maker's page gives no EPA and DHA amount per chew in the text we could read (checked 2026-10-13) (checked October 13, 2026), so we cannot rank it.

Which form for picky eaters, small dogs and large dogs?

• Picky eaters: chews, or a softgel hidden in a treat. If a liquid makes your dog skip meals, try a smaller amount mixed in thoroughly or a different form, and tell your vet if appetite changes.
• Small dogs: a liquid, measured carefully, or a low-strength chew. A strong softgel may overshoot.
• Large dogs: a concentrated liquid or several softgels. Check the chew's per-piece number: a high-strength chew may fit, and a weak one would take a large number to match.

Whichever form you choose, the amount that matters is EPA and DHA. Our dosage calculator turns a label into servings.

Oxidation and storage

All fish oil can oxidize, which means it can go rancid. Heat, light and air speed this up. These are general points, not test results for any product:

• Keep the container closed and out of heat and direct sun.
• Follow the label on whether to refrigerate after opening.
• Check the date on the package. Do not give oil that smells sharply off.
• A softgel keeps the oil sealed until use. A bottle is exposed each time it is opened.

Labels do not show how fresh an oil is, and we have not lab-tested any product. Some makers state third-party testing, and we record it only when they do.

The short version

If you want the most EPA and DHA per serving and an easy way to scale, a liquid fits most dogs. If you want zero measuring, a softgel works. If getting your dog to take it at all is the problem, a chew is better than no supplement, as long as you know how much EPA and DHA it provides. See the best fish oil for dogs picks, the full comparison table, or salmon oil for dogs. Ask your vet before starting.

Page updated October 13, 2026. Label data is from manufacturer websites. This is not veterinary advice.