How we compare fish oil products for dogs
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We compare products only by what the manufacturer publishes on the label or the official product page. We calculate a few numbers from it, show our sources, and do not rank by price or by commission. Each product card links to the source page we used and shows the date we last checked it.
Where the data comes from
Every product row is built from the manufacturer's own website or label: the brand, product name, form (liquid, softgel, or chew), oil source, serving size, EPA and DHA per serving, servings per container, and any feeding instructions printed for dogs by weight. Each product card links to the page we used and shows the date we last checked it. We do not use retailer listings or customer reviews as a source for these numbers. Some makers' sites block automated access. For those products a few figures came from published search extracts of the maker's page or from label text published elsewhere, not from our own reading of the page. We re-check those figures against the maker's page whenever we can reach it. When a manufacturer page and a label disagree, or an older and a newer label differ, we note it.
EPA and DHA per serving
EPA and DHA are the two long-chain omega-3 fatty acids that dog fish oil is mostly bought for. Many labels show only "total omega-3" or "fish oil" in milligrams, which also counts other fats. We use the EPA and DHA figures themselves and add them to get EPA+DHA per serving. If a maker publishes only a combined EPA+DHA figure, we use that. Products that publish neither are not ranked.
EPA and DHA per milliliter
Serving sizes differ between brands (a pump, a teaspoon, a softgel), so a per-serving number alone is hard to compare. For liquids we also show EPA+DHA per milliliter. Conversions:
- 1 teaspoon = 4.93 mL.
- For a pump bottle, we use the milliliters per pump that the manufacturer states. If the maker does not state it, we do not calculate a per-mL figure.
- Softgels and chews are compared per piece, since a milliliter does not apply.
Servings per container and how long it lasts
Servings per container is taken from the label. Where we show how long a container lasts for a 50 lb dog, we divide the EPA+DHA in the container by the daily amount from the maintenance range in the veterinary sources listed on our dosage calculator page. That figure is arithmetic, not a feeding recommendation. It is left out when the label data or the dosing sources are incomplete.
NASC Quality Seal
The National Animal Supplement Council (NASC) runs a quality program for pet supplement makers. A product with the NASC Quality Seal comes from a company that has agreed to NASC's manufacturing and labeling standards and to audits. It does not mean the product is right for your dog, and it does not mean we tested it. We show the seal as "Yes" when the maker states it, and say "not published by the manufacturer" when we could not find a statement.
Why some brands say "not published"
Some makers do not print EPA and DHA amounts, only "omega-3" or a fish oil volume. That is useful information in itself, because you cannot work out a dose without those numbers. We list those products separately instead of guessing, and we do not rank them.
Why we do not show prices
Prices on Amazon change often, and a price we published would be wrong by the time you read it. The "Check price on Amazon" button takes you to the current listing. When we have not yet matched a product to one exact Amazon listing, the button says "Search on Amazon" instead and opens an Amazon search for that brand and product name, so check the size and formula on the listing before you buy. Our order is by label data, so it would not change with price anyway.
Ranking
Tables are sorted by the label number named in the table, usually EPA+DHA per serving or per milliliter. Affiliate links do not affect the order. See the affiliate disclosure.
How often we re-check
We re-check manufacturer pages and product links monthly. The date on each product card is when that product was last checked, and the date at the top of a page is when we last changed that page.
Reporting an error
If a figure looks wrong, use the contact page and include the manufacturer link. We will verify it against the source, fix it, and update the page date.
This site is general information, not veterinary advice. Ask your veterinarian before giving your dog any supplement.