Nutramax Welactin Omega 3 Fish Oil for Dogs, Skin and Coat Health Supplement, Plus Joint, Immune, Kidney, and Brain Support, Premium Omega 3 Fatty Acids, For Dogs, 16 Ounce Liquid Review
By Marcus Bell · Dog nutrition editor · Published 2026-06-16 · Updated 2026-06-28
4.6(6,882)Amazon rating$29.9910,000+ bought last month
Our verdict
Nutramax Welactin Omega 3 Liquid is a salmon oil based supplement that's become one of the best selling fish oils on Amazon, and with 6,882 reviews at a 4.6 star average plus roughly 10,000 units bought last month, it's a proven pick for skin, coat, joint, immune, kidney, and brain support.
Owners who want a widely trusted, high volume liquid fish oil that covers skin and coat along with joint, immune, kidney, and brain support in one bottle.
Skip if
You'd rather give a mess free capsule or chew instead of measuring a liquid, or you're looking for a formula targeted narrowly at just one health concern.
Form Liquid
Benefits Skin Care
Best for Average, Large, Small
Breed size Large
Weight 0.95 Pounds
Priced 20% above the category median ($24.99 across 75 tracked models)
Our scorecard
4.6/5overall
Owner rating4.6/5
4.6 average across 6,882 owner ratings
Popularity4.3/5
6,882 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog food and health supplements we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
["This 16 oz liquid bottle is built around salmon oil and omega-3 fatty acids, and Nutramax markets it as a skin and coat health supplement that also supports joint, immune, kidney, and brain function. It's labeled for large breed dogs in this listing, though the specific uses field also references average and small sized dogs.", 'At $29.99, this sits in the mid range for premium liquid fish oils, and its popularity reflects that price point paired with the Nutramax name, which many owners already know from other Welactin and joint supplement lines.', 'With 6,882 reviews and a 4.6 star average, plus an estimated 10,000 units bought in the past month, this is one of the highest volume sellers in the entire dog fish oil category, ranking #9 overall.']
Pros
Salmon oil and omega-3 formula marketed for skin, coat, joint, immune, kidney, and brain support
Very high sales volume with roughly 10,000 units bought last month
Strong 4.6 star average across 6,882 reviews
Trusted Nutramax brand name
Cons
Liquid format needs careful measuring and consistent refrigeration
Price is mid range compared to some cheaper store brand oils
Labeled for large breed dogs, so smaller dogs may need adjusted dosing
Specifications
Form
Liquid
Benefits
Skin Care
Best for
Average, Large, Small
Breed size
Large
Weight
0.95 Pounds
Performance notes
The salmon oil base delivers a natural omega-3 fatty acid profile, and Nutramax extends the marketed benefits beyond skin and coat into joint, immune, kidney, and brain support, positioning this as a broader wellness liquid rather than a single purpose coat oil.
What buyers say
With 6,882 reviews at a 4.6 star average and an estimated 10,000 units bought in the past month, this is one of the best selling and most consistently well rated liquid fish oils in the category.
The formula is built around salmon oil and omega-3 fatty acids, which Nutramax markets primarily for skin and coat health with additional joint, immune, kidney, and brain support benefits listed.
Is this liquid formula sized for a specific breed?
This listing is labeled for large breed dogs, though the specific uses field also references average and small sized dogs, so check with your vet on dosing for your dog's size.
How does this compare to Nutramax's softgel version?
This is the liquid version of Welactin, which some owners prefer for easier dose adjustment by weight, while the softgel version offers fixed per capsule dosing instead.
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