Welactin Canine Omega-3 Liquid

What changed on this page, and why

We re-verified this product against its Amazon listing and the manufacturer's own guaranteed analysis in August 2026, and the biggest correction is ours to own: our earlier copy described a pump bottle delivering EPA 200 mg and DHA 130 mg per pump. The bottle Nutramax sells today doses with a 6 mL measuring scoop, and the guaranteed analysis reads 1,610 mg total omega-3 and 1,330 mg combined EPA+DHA per scoop. If you are following an old dosing note — ours or anyone's — against a current bottle, you could be off by several fold. Use the chart printed on your bottle.

The dosing chart, and the real running cost

Dogs of 5–9 lb get half a scoop every other day, which is the chart's own admission that a 6 mL scoop is coarse hardware for a small dog. Prices are the August 2026 Amazon price, sold by Amazon.com itself — no reseller markup pattern here — and were unchanged on 15 October 2026 ($29.99, $28.49 on Subscribe & Save, buy box Amazon.com).

For a 70 lb dog, the weight people most often ask about: the label's 1½ scoops is 9 mL a day, 1,995 mg of EPA+DHA on the maker's panel, about 48% of the roughly 4,150 mg Colorado State's osteoarthritis chart works out to at that weight. It costs about $0.58 a day ($210 a year), adds roughly 74 kcal a day on the USDA fish-oil figure used further down this page, and empties the bottle in about 53 days. At the CSU figure it would be about 3.1 scoops, 150 kcal, $1.20 a day and a bottle every 26 days, which is a vet's decision, not a pour.

The chart on the bottle is not the joint dose

This is the finding that matters most on this page, and it took reading two of Nutramax's own products side by side to see it.

Welactin Canine's administration chart has one column. Underneath it sits a single sentence: "Veterinarians may recommend increased amounts for enhanced joint health support." No number. That is the entire guidance an owner buying this bottle for an arthritic dog receives.

Now put a number on it.

The right-hand column comes from Colorado State University's published canine fish-oil dosing chart, which works from 310 mg/kg^0.75 of EPA+DHA per day for dogs with osteoarthritis (read 19 August 2026). Note the middle row: a 75 lb dog on the label sits at 1½ scoops because the band runs 45–79 lb, so the larger the dog inside a band, the further under he falls.

And Nutramax is not unaware of this. Its Welactin Advanced 3TA — a concentrated version sold alongside this one — prints a chart with two columns, "Broad Spectrum" and "Joint Health," and the joint column is exactly double the broad-spectrum one at every weight. For a 68–77 lb dog that is 5 scoops of 2 mL, about 4,400 mg of EPA+DHA a day, which is essentially the CSU figure. The same company publishes the joint dose on one product and a footnote on the other.

Do not simply double the scoop yourself. CSU's own note is that the maximum dose is not tolerated by all animals, and recommends beginning at roughly a quarter of it and titrating up while watching for loose stool and vomiting. The useful thing this page can do is hand you both numbers so the conversation with your vet starts with arithmetic instead of "a squirt on his dinner."

Two panels, two answers

On 19 August 2026 the maker's site published 1,610 mg total omega-3 and 1,330 mg combined EPA+DHA per 6 mL scoop. On the same day, a veterinary supply retailer's page for the same 16 oz bottle published 1,770 mg total omega-3, 870 mg EPA and 570 mg DHA — 1,440 mg EPA+DHA — per the same 6 mL scoop. Both were live simultaneously; the retailer's numbers are higher on both counts.

On 15 October 2026 the higher set had reached the Amazon listing we link to. Its "Important information" panel for this ASIN reads "min 1,770 mg" total omega-3, "min 870 mg" EPA and "min 570 mg" DHA per 6 mL scoop, under an ingredient line of fish oil with vegetable oil, mixed tocopherols, rosemary and green tea extract. welactin.com printed 1,610 mg and 1,330 mg the same day, unchanged. So the maker's own website now publishes a lower figure than the minimum on the page where most buyers check out. Neither surface names the fish; Nutramax's leaflet attached to the listing says "cold-water fish."

We use the maker's figures throughout this page and in the table above, and we are printing the disagreement rather than quietly picking a side. If you are computing a dose against a published study, read the panel on the bottle in front of you, not any page on the internet including this one.

Two more absences worth naming, both verified today. Neither surface publishes a calorie figure for a scoop of this oil. Fish oil is the most calorie-dense thing an owner can add to a bowl, and body weight is the largest modifiable factor in canine osteoarthritis, so a joint supplement that will not tell you what it adds to the day's intake is working against the intervention that has the best evidence of all. And the "#1 veterinarian recommended omega-3 supplement brand" line on the listing carries a footnote on welactin.com reading "Survey conducted among small animal veterinarians who recommended omega-3 supplements" — a universe drawn around vets who already recommend the category, with no year, no sample size and no named surveyor.

What the evidence is, and what it is not

The most-cited omega-3 result in arthritic dogs is a randomized, double-blinded, controlled JAVMA trial (Roush et al., 2010;236:67–73): 38 client-owned dogs with osteoarthritis, the test group fed a food containing 3.5% fish oil omega-3s. Over 90 days the test group's mean peak vertical force — measured on a force plate, not scored by eye — rose 5.6%, and 82% of test dogs improved against 38% of controls. Corrected 14 September 2026: that 5.6% is a within-group change (the test group against its own baseline; the control group's 0.4% was not significant). The abstract does not report a significant difference between the diet and the control food, and the Helsinki group that later ran the largest independent trial read the full paper the same way. We had printed the two percentages side by side as though they were a head-to-head result. They are not.

Read the asterisk before you buy: that was a therapeutic diet, not a bottle of fish oil added to ordinary food, and Welactin itself has never been trialled. Two placebo-controlled trials of other fish oils over ordinary food do exist, and they pull in opposite directions. The un-commissioned University of Helsinki trial (Hielm-Björkman et al., BMC Vet Res 2012;8:157) gave 77 dogs about 110 mg/kg/day of EPA+DHA for 16 weeks and found no significant difference from corn oil on force plate, pain index or NSAID use. A 2016 US trial (Mehler et al., Prostaglandins Leukot Essent Fatty Acids 2016;109:1–7) gave 78 dogs an average of 69 mg/kg/day for 84 days and found all three clinician exam scores improved against a mineral-oil placebo; it used no force plate and the trade report describes it as industry-associated. The full reconciliation, with every dose priced for a 75 lb dog, is in Hill's j/d vs adding fish oil. A dosed liquid is a sensible way to pursue the same mechanism without changing foods, and that is the honest ceiling of the claim. The listing's "#1 vet recommended omega 3 supplement brand" line is the brand's survey, not evidence about your dog.

The trial doses, translated into this scoop

The label chart is a skin-and-coat dose. If you and your vet decide to dose for a joint instead, the two bottle trials above and Colorado State's canine osteoarthritis chart are the only published waypoints, and none of them is printed on the bottle. Here is each one as scoops of this product (1,330 mg EPA+DHA per 6 mL scoop, maker's guaranteed analysis), with the label dose for comparison. Calories use the veterinary literature's ~42 kcal per 5 mL, since Nutramax publishes none.

Three things to take from the table. For a dog under about 40 lb the label scoop already exceeds the only placebo-beating bottle dose, so "more" has no trial behind it at that size. For a large dog the label is the lowest number on the row and the bottle lasts far less time than the chart suggests — at the 69 mg/kg dose a 75 lb dog empties the 480 mL bottle in about 45 days, not 7 weeks, and at the CSU figure in about 24 days. And the highest dose in the table is the one that failed to separate from placebo in the only independent trial, so the argument for going up is not "the trial dose works"; it is that a dose you chose, wrote down and scored against is the only kind you can learn from. Every figure above the label is a vet conversation, with a ramp and a food reduction to pay for the calories, not a pour.

Head-to-head: this bottle or Welactin Advanced 3TA?

Nutramax's own sibling product is the obvious alternative for an arthritis buyer, because it is the one whose label admits what you are dosing for. The comparison, on the numbers, is closer than the two labels suggest — all figures read 25 August 2026.

Read the second-to-last rows together and the choice sorts itself. Per bottle, the two products carry almost exactly the same total EPA+DHA, so at the cheapest vet-retail price we found the cost per milligram is effectively a wash — and at the top of the vet-channel spread, 3TA costs about a third more for the same omega-3s. What 3TA actually sells is not concentration. It is the label: a printed two-column chart you can follow without doing any of this page's arithmetic, and a finer 2 mL scoop that makes a gradual titration easier to measure, especially under 40 lb. What it costs you is channel: no Amazon listing, a price that varied 35% across the vet storefronts we checked on one day, and a "3TA" marketing story whose third omega-3, ETA, amounts to 10 mg a scoop next to 880 mg of EPA+DHA. If your vet practice sells 3TA near the low end of that spread and your dog is on a joint titration, it is a reasonable buy for the label alone. If you are price-checking on Amazon, this bottle is the same omega-3s — you are just carrying the arithmetic yourself, which is what the table above is for. We earn nothing on 3TA either way.

The cheaper thing first

If your dog already eats a fish-based or veterinary joint diet, you may be buying omega-3s he is already getting. The catch, which we only established by reading six bags at source on 18 September 2026, is that the bag usually cannot tell you. Of Hill's j/d, Hill's Science Diet Healthy Mobility, Purina JM, Royal Canin Advanced Mobility Support, Blue Buffalo's fish recipe and Orijen Six Fish, only Orijen prints EPA and DHA on their own lines; j/d prints EPA but not DHA; the other four print a "total omega-3" minimum that lumps flaxseed ALA in with the marine fatty acids this bottle is measured in. So the instruction is not "check the bag." It is: if the bag prints EPA and DHA, add them up before you buy this, and if it prints only "omega-3," email the maker for a typical EPA+DHA figure as fed and treat the bag as unknown until it answers. The arithmetic for a 75 lb dog on each of those six bags is in our omega-3-in-the-bag article. Plain sardines in water are the folk alternative; they work out cheaper only for small dogs, and you give up the measured dose, which is most of what you are paying Welactin for.

Switch the food, or add this bottle?

The question people ask just before they buy this is whether a fish-heavy kibble would do the same job. On 25 September 2026 we read fourteen fish and joint dry foods at source and ranked them by the EPA+DHA their guaranteed minimums deliver per 1,000 kcal. The numbers that bear on this bottle:

Cost per 1,000 mg of EPA+DHA from this bottle is about $0.29 at $29.99 for roughly 78 scoops. Getting the same 1,000 mg by trading up from Acana Classics to Orijen Six Fish costs about $0.72. The bottle is the cheaper milligram, and it changes one variable where the food change moves fat, protein, fibre and calories at once.

The reason that matters more than price: this dose does not ride in the ration. A dog whose EPA+DHA comes from his food loses part of it the day his vet cuts his calories for weight loss: Orijen Six Fish delivers about 4,390 mg at 1,500 kcal and about 2,930 mg at 1,000. A scoop stays a scoop. For a heavy arthritic dog about to start a diet, which is most of them, that is the practical case for a bottle over a bag.

Where the switch wins, or the bottle should not be added at all. If the dog needs a new food anyway and the vet is happy with 38–43% of calories from fat, a bag that prints EPA and DHA removes a daily chore. And two bags already print more EPA+DHA per calorie than the National Research Council's safe upper limit of 2,800 mg per 1,000 kcal on their minimums alone: Farmina N&D Ocean Cod, Pumpkin & Orange (about 4,270 mg, 153%) and Orijen Six Fish Recipe (about 2,930 mg, 104%). A dog on either should not get this bottle on top without a vet's say-so. Each scoop also adds roughly 49 kcal (USDA FoodData Central puts salmon oil at 902 kcal per 100 g and 4.5 g per teaspoon), which has to come off the kibble. The full fourteen-bag table is in which dog food has the most EPA and DHA.

Who should not buy it

• Dogs on anticoagulants, with clotting disorders, or with surgery scheduled — tell your surgeon the exact daily EPA+DHA before the pre-anesthetic visit.
• Dogs with a history of pancreatitis — added dietary fat needs a vet's sign-off first.
• Dogs eating Orijen Six Fish Recipe or Farmina N&D Ocean Cod, Pumpkin & Orange (whose floor is about 4,270 mg per 1,000 kcal, re-read 25 September 2026), or any bag whose printed EPA+DHA is already at the Colorado State figure. Orijen's guaranteed floor of 0.4% EPA and 0.7% DHA as fed works out to about 4,390 mg a day for a 75 lb dog at 1,500 kcal, which is the CSU maximum on its own; the label's 1½ scoops on top would take that dog to roughly 6,400 mg, about 46% over the chart, with the loose stools CSU warns about and no way to say which change did what (Orijen panel read 18 September 2026).
• Households that free-feed. The dose rides on a meal being eaten while the oil is fresh; a grazer's bowl with oil on it sits out for hours.
• Owners who want the strongest-evidence version of this bet and are open to changing foods: the trial evidence belongs to enriched diets, and your vet can name one.