Fish Oil vs Krill Oil for Dogs
Both deliver EPA and DHA. The difference is concentration per dose, cost per milligram and how much oil you have to get into the dog.
The short version
For most dogs, fish oil is the practical choice, because the therapeutic doses used for joints and skin are measured in hundreds to thousands of milligrams of combined EPA and DHA per day, and concentrated fish oil delivers that in a volume a dog will actually accept. Krill oil supplies the same two fatty acids in a phospholipid form that some research suggests absorbs efficiently, but the per capsule content is typically low, so hitting a real dose gets expensive quickly. Compare products on milligrams of EPA plus DHA per dollar, not on the size of the bottle or the word premium.
At a glance
| Nordic Naturals Omega-3 Pet | Alpha Dog Nutrition Krill Oil | |
|---|---|---|
| Active ingredients | EPA and DHA | EPA and DHA |
| Typical dose volume | Millilitres of oil | Capsules, low content each |
| Cost per milligram of EPA and DHA | Lower | Higher |
| Fishy smell | Noticeable | Usually milder |
| Easy to hide in food | Pump onto wet food | Hidden in a treat |
| Oxidation risk | Refrigerate after opening | Capsule protects it |
Choose the Nordic Naturals Omega-3 Pet if…
Choose fish oil if you want a meaningful dose without a handful of capsules. A pump bottle onto wet food is the simplest route, and the concentration per pump is printed on the label so you can work out the daily total. Keep it refrigerated once open and throw it out if it smells sharp or rancid, because oxidised oil is worse than none. Introduce it gradually, since a full dose on day one commonly causes loose stools.
Check Nordic Naturals Omega-3 Pet on Amazon
Choose the Alpha Dog Nutrition Krill Oil if…
Choose krill oil if your dog will not tolerate liquid oil on food, if the smell of fish oil is a problem in your house, or if capsules are simply easier to give with a treat. Read the panel closely: many krill products list total oil rather than EPA and DHA, and the actual omega 3 content per capsule is often small. Work out how many capsules a day your dog's target dose would take before you compare prices. Krill is a shellfish product, so avoid it in a dog with a known shellfish reaction.
Check Alpha Dog Nutrition Krill Oil on Amazon
Full reviews
Our Nordic Naturals Omega-3 Pet review covers the triglyceride form, the storage problem with liquid oil, and the side effects worth knowing before you start.
Related
Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these products side by side. Confirm current specifications and prices before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Editor's Pick · Affiliate link
An Orthopedic Bed for a Stiff Senior Dog
A supportive memory-foam bed is the cheapest change that visibly helps an arthritic dog get up more easily. Waterproof and washable matters more with age.
Frequently Asked Questions
How much EPA and DHA does a dog need?
It depends on the dog's weight and on what you are treating, and the doses used for inflammatory conditions are considerably higher than the maintenance amounts on most labels. Ask your vet for a figure in milligrams per day for your dog rather than guessing from the bottle, particularly if the dog is on other medication. Too much causes loose stools, and at high doses can affect platelet function, which matters before surgery.
Can I give my dog human fish oil capsules?
Usually yes on the ingredient side, provided the product contains nothing but fish oil and vitamin E. Check for added vitamin D, which is easy to overdose in a dog, and for xylitol in any flavoured or chewable version, which is dangerous. The bigger practical problem is dose, since a human capsule gives one fixed amount and a small dog needs a fraction of it. Confirm with your vet before starting.
Will fish oil fix my dog's itchy skin?
It can help as part of a plan, and the evidence for omega 3 supplementation in canine skin disease is reasonable, but it works slowly and it does not treat fleas, food reactions, infection or environmental allergy. Skin that is red, smelly, weeping or losing hair needs diagnosing before it needs supplementing. Give any oil at least eight weeks before deciding whether it helped.
Need more help with your aging dog?
Browse our guides by topic to find practical solutions.
Wellness Planner, $39