Omega-3 For Dogs Calculator

Estimate a daily omega-3 (EPA+DHA) dose for your dog from its body weight, and convert it into fish-oil capsules.

Quick Facts

Method
EPA+DHA dose scaled to metabolic body weight (kg^0.75)
Maintenance ≈ 75 mg/kg; therapeutic and upper limits scale as mg per kg^0.75 per day.

Your Results

Calculated
Daily EPA+DHA dose
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Combined omega-3 per day
Fish-oil capsules / day
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At your label's EPA+DHA
Metabolic body weight
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kg^0.75
Dose per kg
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EPA+DHA / body weight

Ready

Enter your dog's weight and run the calculator.

About the Omega-3 For Dogs Calculator

Omega-3 fatty acids for dogs are dosed as the combined amount of the two active long-chain fatty acids found in marine fish oil: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). These are the anti-inflammatory omega-3s that veterinary research targets for skin allergies, itch, arthritis, chronic kidney disease, and heart disease. The plant-derived omega-3 ALA (from flaxseed) is not counted, because dogs convert almost none of it into EPA and DHA. This calculator takes your dog's body weight and returns a suggested daily EPA+DHA amount, then converts that into how many of your fish-oil capsules to give.

The formula

Doses are scaled to metabolic body weight — body weight in kilograms raised to the 0.75 power (BWkg0.75) — which is how veterinary nutrition normalizes for the fact that small dogs have a higher metabolic rate per kilogram than large dogs. The tiers used here are:

  • Maintenance / general wellness: about 75 mg EPA+DHA per kg of body weight per day (a widely used everyday-supplement target for coat and general health).
  • Therapeutic (vet-guided): about 125 × BWkg0.75 mg per day — the higher anti-inflammatory range used clinically for conditions like atopic dermatitis and osteoarthritis.
  • Upper safe limit: about 310 × BWkg0.75 mg per day — the maximum EPA+DHA intake reported as safe for healthy adult dogs by Bauer (JAVMA, 2011). Do not routinely dose at this ceiling.

Pounds are converted with 1 kg = 2.2046 lb before the metabolic-weight step. The capsule count divides the daily EPA+DHA dose by the EPA+DHA milligrams stated on your product's label (not the total oil weight).

Why it is needed

Supplement labels almost never dose in "mg of EPA+DHA per kg" — they tell you drops or softgels per weight band, and a "1000 mg fish oil" capsule typically contains only about 300 mg of actual EPA+DHA. That gap is where owners over- or under-dose. Working the dose out in EPA+DHA milligrams first, then translating to capsules, keeps the meaningful number front and center and makes different brands directly comparable.

Reference points

  • A standard fish-oil softgel labeled "1000 mg" usually delivers roughly 300 mg EPA+DHA (about 180 mg EPA + 120 mg DHA).
  • At the 75 mg/kg maintenance rate, a 10 kg (22 lb) dog needs about 750 mg/day — around 2.5 standard capsules.
  • A 30 kg (66 lb) dog at maintenance needs about 2250 mg/day; at the therapeutic 125 × kg0.75 rate it rises to roughly 1600 mg/day — note therapeutic scales more gently with size, so for large dogs the metabolic-weight tiers can be lower than the flat 75 mg/kg maintenance number, which is expected.

Frequently Asked Questions

Is fish oil the same as the EPA+DHA dose?
No. The dose that matters is the combined EPA+DHA content, not the total volume of oil. A capsule labeled "1000 mg fish oil" often provides only about 300 mg of EPA+DHA. Always read your product's label for the EPA and DHA milligrams per capsule or per pump, and enter that number so the capsule count is correct.
Why is the dose based on weight to the 0.75 power?
Metabolic rate does not scale linearly with body weight — a 40 kg dog is not simply twice as "metabolically large" as a 20 kg dog. Veterinary nutrition uses metabolic body weight (kg raised to 0.75) to reflect this, which is why therapeutic and upper-limit omega-3 doses are expressed per kg^0.75 rather than per kg. The maintenance tier here uses a simpler flat per-kg rate common on wellness labels.
Can I give my dog too much omega-3?
Yes. High EPA+DHA intakes can cause loose stool or diarrhea, and at very high doses may prolong bleeding time, affect platelet function, add unwanted calories, or upset the balance of other fatty acids and vitamin E. The upper-limit tier here reflects a maximum reported as safe for healthy adult dogs; it is a ceiling, not a target. Confirm any therapeutic dose with your veterinarian, especially for dogs on medication or with clotting, liver, or pancreatic conditions.

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