Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
If your dog is scratching relentlessly, losing fur in patches, or slowing down with stiff joints, a high-quality supplement might be the missing piece. Cod liver oil packs omega-3s, vitamin A, and vitamin D into a single daily dose that directly targets skin irritation, coat dullness, and joint discomfort — and the right bottle for your dog depends on purity, omega strength, and whether your dog will actually eat it.
I’m Mohammad Maruf — the founder and writer behind WellFizz. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Whether you have a senior dog that lost its bounce or a young pup with dry, flaky skin, this breakdown of the best cod liver oil for dogs will help you match the right formula to your dog’s specific needs.
Quick Picks
- Nordic Naturals Pet Cod Liver Oil, Unflavored — Best Overall
- Wild-Caught Pure Icelandic Cod Liver Oil (CountryPet Naturals) — Highest Omega-3
- Pure Cod Liver Oil for Dogs (Chew + Heal Labs) — Budget Champion
How To Choose The Best Cod Liver Oil For Dogs
Not all cod liver oils are the same. The difference between a bottle that transforms your dog’s coat and one that just sits in the fridge depends on a few specific specs you can check before buying.
Omega-3 Strength: The Number That Drives Results
Look for the total milligrams of omega-3s per teaspoon — this is the single most useful number on the label. Higher omega-3 levels (above 1,000 mg per serving) typically deliver faster, more visible improvements in skin health, coat shine, and joint comfort. Lower doses may take weeks longer to show effect, if they do at all.
Sourcing and Purity: Wild Caught vs. Farmed
Cod liver oil sourced from wild-caught fish in cold waters (like the Arctic or Iceland) tends to be cleaner and more concentrated. Farmed cod can carry lower omega-3 levels and a higher risk of contaminants. Look for language like “100% wild Arctic cod” or “wild-caught Icelandic cod” to know you are getting the good stuff.
Added Vitamins: What A and D Actually Do
Cod liver oil is unique because it naturally contains vitamin A and vitamin D alongside the omega-3s. Vitamin A supports vision and skin repair, while vitamin D helps with calcium absorption for bone and joint health. This is a key advantage over plain fish oil, which lacks these fat-soluble vitamins.
Quick Comparison
| Model | Best For | Omega-3 Per Serving | Serving Size | Bottle Size | Amazon |
|---|---|---|---|---|---|
| Pure Cod Liver Oil (Chew + Heal Labs) | Value & Simplicity | — | — | 8 fl oz | Amazon |
| Wild-Caught Pure Icelandic (CountryPet Naturals) | Highest Omega-3 | 1150 mg | 1 tsp | 8 fl oz | Amazon |
| Nordic Naturals Pet Cod Liver Oil | Premium Purity | 1048 mg | 1 tsp | 8 oz | Amazon |
In‑Depth Reviews
1. Nordic Naturals Pet Cod Liver Oil, Unflavored
The premium pick with 1048 mg omega-3s per teaspoon that stopped raw itching spots.
This is the bottle you reach for when you want the closest thing to human-grade purity for your dog. Nordic Naturals sources its oil from 100% wild Arctic cod and processes every batch to keep the omega-3s in triglyceride form (the natural molecular structure your dog’s body absorbs most easily). At 14.24 ounces, the bottle is noticeably heavier than the 8-ounce options from Chew + Heal and CountryPet Naturals, which means fewer reorders for the same daily routine. Buyers report that their dogs stopped scratching constantly even after having scratched themselves raw in several places, and one owner noted that a 14-year-old golden retriever showed major hip improvement when paired with green-lipped mussel powder.
The trade-off is the scent. A few reviewers mention the fishy odor lingers more than they expected, though dogs themselves seem to love the taste. If your dog is a picky eater or you are sensitive to smells, the unflavored formula still carries that cod aroma — but the results on skin and coat quality are hard to argue with. This oil also supports brain, eye, and immune health on top of its coat and joint benefits, making it one of the more complete supplements on the shelf.
Why It Leads
- Highest omega-3 per serving among these three at 1,048 mg per teaspoon
- Triglyceride molecular form for optimal absorption
- Trusted brand with rigorous purity and ethical sourcing standards
The Real Catch
- Noticeable fishy scent that lingers on the bottle surface
- Premium price point versus value-oriented competitors
- Bottle size (14.24 oz) can be cumbersome for daily pouring
Best for: Owners who want maximum purity and proven results for chronic skin issues, senior dogs, or any dog that needs a broad-spectrum omega-3 boost.
Consider another if: You are on a tight budget — the value picks below deliver results for less money, though with a slightly lower omega-3 count.
2. Wild-Caught Pure Icelandic Cod Liver Oil (CountryPet Naturals)
The single-ingredient Icelandic oil that delivers 1150 mg omega-3s and cleared a puppy’s knuckling.
This bottle leads the trio in raw omega-3 concentration at 1,150 mg per teaspoon, versus 1,048 mg per teaspoon for the Nordic Naturals pick. It is made from 100% wild-caught Icelandic cod with no preservatives, no additives, and none of the common allergens — it is even labeled as corn-free, dairy-free, and gluten-free. One reviewer noted that it helped clear up severe knuckling over in a large-breed puppy between weeks 7 and 10 when combined with dietary adjustments, a specific mobility result that goes beyond the usual coat-and-skin claims.
The pump bottle design is a genuine convenience for daily use — you can squirt it directly onto kibble without unscrewing a cap. But several owners mention the pump tends to fail or leak after a few weeks, making the bottle sloppy. The oil itself has very little fishy aroma compared to the Nordic Naturals bottle, which is a plus if your kitchen counters are sensitive to lingering smells. At 8 ounces, it is lighter than the Nordic Naturals bottle at 14.24 ounces and matches the Chew + Heal option at 8 fluid ounces.
Standout Perk: Highest omega-3 count in the lineup at 1,150 mg per teaspoon, and the pump dispenser makes it easy to add to any meal.
Watch Out For: The pump mechanism is the most common complaint — you may end up transferring the oil to a different bottle mid-way through.
Reach for this if: Your dog has specific joint or mobility issues and you want the strongest omega-3 dose available in this price tier.
Look elsewhere if: You want a bottle that lasts longer — the 8-ounce size runs out faster than the 14.24-ounce Nordic Naturals option.
3. Pure Cod Liver Oil for Dogs (Chew + Heal Labs)
The no-frills 8-ounce bottle that turned a 13-year-old Chorkie puppy-like in days.
If your priority is getting a pure cod liver oil into your dog’s bowl without paying for fancy packaging or a high omega-3 count, this is your pick. Chew + Heal Labs keeps the ingredient list simple — just cod liver oil, no additives, no preservatives — and sources it from US-based production. One buyer wrote that their 13-year-old Chorkie seemed like a new puppy after just a couple of days taking this stuff, and another owner noted their dog’s coat became shinier and softer with noticeably less skin irritation and dandruff.
Unlike the CountryPet Naturals bottle (which offers 1,150 mg omega-3 per teaspoon) and the Nordic Naturals bottle (1,048 mg), Chew + Heal does not publish an omega-3 milligram count on the label, making it harder to compare potency directly. Some buyers wish the bottle came with a pump to make pouring easier, but the dogs do not seem to mind the cod flavor. At 8 fluid ounces, it is the same volume as the Icelandic oil and smaller than the Nordic Naturals bottle at 14.24 ounces, meaning you will reorder more often.
What Works
- Clean ingredient list — no fillers, preservatives, or additives
- Made in the USA with clear dosing instructions on the package
- Customers note fast visible results on coat shine and energy levels
The Catch
- Omega-3 content per serving is not listed on the product page — less transparency than competitors
- No pump included, so pouring can be messy
- Smallest bottle (8 fl oz) compared to the 14.24 oz Nordic Naturals option
Ideal for: Shoppers on a budget who want a clean, straightforward cod liver oil without paying for a premium brand or higher omega-3 concentration.
skip it if: You want a specific omega-3 milligram count to track your dog’s daily intake — the lack of that data makes comparisons harder.
Understanding the Specs
Omega-3 (EPA and DHA) Per Serving
This is the single most important number. Measured in milligrams per teaspoon, the omega-3 count directly determines how much anti-inflammatory power your dog gets per dose. Higher counts (1,000 mg or more per teaspoon) typically mean faster, more visible results on skin, coat, and joint health. The countryPet Naturals bottle leads at 1,150 mg, while Nordic Naturals comes close at 1,048 mg — both strong options. If a product does not list its omega-3 milligram count, you are flying blind on potency.
Source: Wild-Caught Arctic or Icelandic Cod
Cod liver oil is only as clean as the fish it came from. Wild-caught cod from cold northern waters (Arctic, Iceland) tends to produce oil with higher omega-3 concentration and lower contaminant risk. Both Nordic Naturals (wild Arctic cod) and CountryPet Naturals (wild-caught Icelandic cod) explicitly state their sourcing. The Chew + Heal bottle is made in the USA but does not specify wild-caught status, which makes its purity harder to verify from the label alone.
FAQ
What is the difference between cod liver oil and regular fish oil for dogs?
How much cod liver oil should I give my dog daily?
Can cod liver oil help with my dog’s itching and allergies?
Will cod liver oil make my dog’s breath or food smell fishy?
How long does an 8-ounce bottle of cod liver oil last for a medium-sized dog?
Is cod liver oil safe for puppies and senior dogs?
Should I refrigerate cod liver oil after opening?
How do 1,048 mg and 1,150 mg omega-3 per serving compare?
Can I use human cod liver oil for my dog?
How do I get my picky dog to eat cod liver oil?
Final Thoughts: The Verdict
For most people, the cod liver oil for dogs winner is the Nordic Naturals Pet Cod Liver Oil because it combines a high omega-3 dose (1,048 mg per teaspoon) with rigorous purity sourcing from wild Arctic cod and the broadest health support covering skin, coat, brain, eye, and immune function. If you want the single highest omega-3 count available at 1,150 mg per teaspoon in a pump bottle, grab the Wild-Caught Pure Icelandic Cod Liver Oil from CountryPet Naturals. And for a straightforward, budget-friendly option that gets fast results on coat shine and energy without additives, the Chew + Heal Pure Cod Liver Oil delivers real value.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, WellFizz earns from qualifying purchases. This does not affect which products we feature.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.