Best fish oil for cats: compare omega-3 products by label

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

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To compare fish oil for cats, look at the EPA plus DHA in one serving and in each mL, not the "fish oil" milligrams on the front. Cats are small, so the serving size matters as much as the strength. No safe upper limit exists for cats, so ask your vet how much to give.

Fish oil for cats, omega-3 for cats and "best fish oil for cats" all lead to the same question: what is actually in the bottle? Labels use drops, mL, teaspoons, pumps and softgels, and some print only total fish oil. This page lines up the label numbers from the makers' websites. We show no prices, and affiliate links do not change the order. See how we compare for the method.

For cats we do label math only. We do not calculate a dose, because nobody has published a safe upper limit for cats. The reasons are in the cautions below. If you also have a dog, the dog pages start at fish oil for dogs and omega-3 for dogs.

Fish oil for cats: products with published EPA and DHA

This table lists products labeled for cats, or for both dogs and cats, whose makers publish EPA and DHA. Serving sizes differ a lot, so a higher number per serving can simply mean a bigger serving. Use the next table to compare strength.

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

Liquid fish oil for cats, ranked per mL

A milliliter is the same on every bottle, so this is the fairest way to compare liquids. For a teaspoon we use 4.93 mL, and for a pump the milliliters the maker states.

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

How to read labels for cats

1. Find EPA and DHA in milligrams per serving. If only "fish oil" or "total omega-3" is printed, you cannot compare the product.
2. Check what one serving is. Nutramax Welactin Feline Omega-3 Liquid (4 fl oz) defines a serving as a small measured amount with 265 mg of EPA+DHA. Seapet Omega PURE Fish Oil for Cats (4 fl oz) defines it as a teaspoon with 1,350 mg. The serving sizes differ far more than the oils do.
3. Use mg per mL to compare strength. Across the four cat-only liquids named on this page, EPA+DHA runs from 130.9 to 273.9 mg per mL. A stronger oil means a smaller measure for the same EPA and DHA.
4. Measure small amounts exactly. Cats are small, so a dropper or small syringe is easier to repeat than a spoon. Do not copy a dog's directions from a label made for both species without asking your vet.
5. Ask for a number in mg of EPA+DHA. If your vet gives you one, divide it by the per-mL figure to find the amount of oil. Count the omega-3 already in your cat's food.

Some cat foods already contain EPA and DHA, so ask your vet what your cat's diet already provides.

Picks by form, from the label data

These are not rankings of quality. We did not test any product. Each note says what the published numbers show.

Liquid, strongest per mL

Seapet Omega PURE Fish Oil for Cats (4 fl oz) has the highest EPA+DHA per mL among the cat liquids in our catalog (273.9 mg). Its serving is a full teaspoon, a large measure for a small animal and the hardest of these to measure precisely by spoon. Check the label directions for cats and ask your vet.

Liquid with a small defined serving

Nutramax Welactin Feline Omega-3 Liquid (4 fl oz) lists a serving of 265 mg EPA+DHA in a small measured amount (1.25 mL), against a full teaspoon for the Seapet above. For a small cat, a smaller labeled serving can make the label easier to follow. See the Welactin page for the dog version.

Liquid blend, cat-labeled

PetWellbeing Omega-3 Icelandic Fish Oil for Cats (8 fl oz pump) shows 265 mg per mL and a serving measured in mL, which is straightforward to read. The maker lists a mix of anchovies, herring, sardines and mackerel.

Salmon oil

NaturVet Salmon Oil for Cats (liquid pump) is a cat-labeled salmon oil with 130.9 mg per mL, lower than the three liquids above. The label shows no servings per container, so we cannot say how long a bottle lasts. More on salmon oil for cats.

Softgel

Nutramax Welactin Feline Softgel Caps (60 ct) lists 210 mg EPA+DHA per softgel and 60 softgels per bottle. A softgel is easy to count, but it cannot be divided into a smaller amount, and many cats refuse capsules.

Chew-style

Nutramax Welactin Tidbits Omega-3 for Cats (4.23 oz / 120 g) lists 133 mg EPA+DHA per serving and may suit a cat that takes treats more readily than oil. Compare its per-serving figure with the liquids in the table above before you assume it replaces one.

Cautions for cats

• No safe upper limit exists for cats. The National Research Council (2006) published none at any life stage, according to Lenox, a board-certified veterinary nutritionist (Today's Veterinary Practice, 2016). The dog limit does not apply to cats. That is why we do not give a dose.
• Studies used whole diets. Cat studies of arthritis and kidney disease used therapeutic foods prescribed and monitored by vets. Their amounts are not home supplement doses.
• Avoid cod liver oil unless your vet approves. VCA lists cod liver oil among common causes of vitamin A poisoning, and says cats are more susceptible than dogs.
• Freshness and vitamin E. Fish oil can oxidize, so keep it sealed and cool and discard it if it smells rancid. The Merck Veterinary Manual says it is thought that too much unsaturated fat with too little vitamin E or other antioxidants can cause inflammation of body fat in cats (yellow fat disease).
• Possible effects on blood clotting and wound healing. Lenox lists these among the concerns with excess omega-3. Tell your vet before surgery and about any medicine your cat takes.
• Plant oils are not a substitute. Flaxseed oil does not give cats EPA or DHA (Lenox, 2016).
• Stop and call your vet if your cat vomits, has diarrhea, or stops eating after starting an oil.

For a cat with kidney disease, see fish oil for cats with kidney disease.

Products without published EPA/DHA we could find

These products are sold for cats or for dogs and cats, but we could not find usable EPA and DHA amounts for them. Without the numbers we cannot compare them, so we list them here instead of guessing.

• 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.
• Nordic Naturals Omega-3 Cat (liquid, 2 fl oz): the maker's cat page gives dose volumes but no EPA and DHA amounts, and retailer figures conflict (checked October 13, 2026), so we cannot rank it.
• Paramount Pet Health Omega-3 Fish Oil for Cats & Small Dogs (2 fl oz dropper): the maker's page does not state the dropper volume, and its figures match the per-teaspoon values of the larger bottle (checked October 13, 2026), so we cannot rank it.
• Pet Honesty Omega-3 Fish Oil for Dogs and Cats (32 fl oz): the maker's pages list conflicting EPA and DHA figures without a defined serving (checked October 13, 2026), so we cannot rank it.
• Vetoquinol Triglyceride OMEGA Liquid Pump (8 fl oz, dogs and cats): the maker lists total fish oil per serving but not EPA and DHA (checked October 13, 2026), so we cannot rank it.
• Vital Pet Life Fish Oil for Dogs and Cats (salmon + pollock, 64 fl oz): a search extract shows minimum EPA and DHA figures but the serving they apply to is unclear, and we could not open the maker page (checked 2026-10-13) (checked October 13, 2026), so we cannot rank it.
• Vital Pet Life Salmon Oil for Dogs & Cats (32 fl oz): the published label figures are internally inconsistent (EPA and DHA exceed the stated total omega-3) (checked October 13, 2026), so we cannot rank it.
• Zesty Paws Hairball Bites for Cats (60 soft chews): the maker page does not state how many chews make a serving, and it is a hairball product rather than a plain omega-3 supplement (checked October 13, 2026), so we cannot rank it.
• Zesty Paws Wild Alaskan Salmon Oil (pollock + salmon, 16 fl oz pump): the maker's page gives marketing text without EPA and DHA amounts (checked 2026-10-13) (checked October 13, 2026), so we cannot rank it.

Where to go next

• Salmon oil for cats: salmon oil compared with blends.
• Fish oil for cats with kidney disease: what the evidence does and does not show.
• How we compare: where the numbers come from.

Page updated October 13, 2026. Label data is from manufacturer websites. This is not veterinary advice, and no veterinarian has reviewed it.