Best Dog Fish Oil and Salmon Oil Supplements (2026): Omega-3 Picks Tested
Our top picks at a glance
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Omega-3 fatty acids are the closest thing to a miracle supplement for dogs: they calm itchy skin, reduce shedding, put a shine back on a dull coat and support stiff joints. The most reliable way to get them is fish oil, usually from salmon. We compared the most popular UK salmon oils and omega-3 capsules on purity, freshness, value per dose, and how easy they are to add to a dog's dinner.
What to look for in a fish oil supplement
- EPA and DHA levels: These are the active omega-3s. Check the bottle for the actual EPA/DHA per dose, not just the total oil weight.
- Freshness: Rancid fish oil smells bad and loses its benefits. Fresh oil should smell mildly fishy, not overpowering. Dark bottles and pump dispensers help protect it.
- Source: Salmon oil from Scotland or Norway (farmed or wild) is the standard for UK brands; purity testing is a plus.
- Format: Pumps are easiest for liquid, capsules suit dogs who refuse the taste, and a dropper helps with small breeds.
The 5 best dog fish oil supplements of 2026
1. Best overall: Pets Purest Scottish Salmon Oil
~£10–£13
With over 21,000 UK reviews this is the salmon oil most owners buy, and for good reason: high EPA and DHA levels, a fresh, mild smell, and a practical pump bottle that makes dosing clean and simple. It works for dogs and cats, and owners report real improvements in itchy skin and shedding within a few weeks.
2. Best value: Bugalugs Scottish Salmon Oil
~£9–£13
Bugalugs packs the same Scottish-sourced salmon oil quality into a slightly cheaper bottle, with a proper pump and high ratings from over 5,000 owners. It's the smart pick for multi-dog households where the bottle empties fast, and it doubles as a tasty food topper for fussy eaters.
3. Best budget: Pooch and Mutt Salmon Oil
~£8–£10
A natural, single-ingredient salmon oil from a well-known UK pet food brand, usually a couple of pounds cheaper than the big names. The dropper-style cap suits small and medium dogs, and the freshness is consistent. A reliable budget option that still delivers proper omega-3s.
4. Best capsules: Primary Pets Omega-3 Fish Oil Capsules
~£8–£14
For dogs who turn their nose up at liquid oil, these 1000mg capsules are the cleanest option: just pop one into their food or push it into a treat. Each capsule delivers a measured dose of omega-3 with no smell, no mess and no fridge needed. Ideal for travel and for owners who want exact dosing.
5. Best big bottle: Petsly Norwegian Salmon Oil
~£16–£20
A full litre of Norwegian salmon oil — enough for months of daily doses at the lowest cost per dose of anything we tested. It's a plain, high-quality oil with a fresh smell and a pump that delivers the right amount for medium and large dogs. Choose this if you want to buy once and forget about it.
How to give fish oil safely
- Start small: Use half the recommended dose for the first 3–4 days so the stomach adapts, then move to the full dose.
- Mix it into food: Liquid oil vanishes into wet food or kibble; capsules can be hidden in a soft treat.
- Store it cold and dark: Keep the bottle in the fridge once opened and use it within the window on the label to avoid rancidity.
- Ask your vet first if your dog has pancreatitis, is on blood thinners, or is having surgery soon.
Bottom line
The Pets Purest Scottish Salmon Oil is the best all-round choice for most dogs, with the Bugalugs close behind on value. Pick the Primary Pets capsules if your dog refuses liquids, and the Petsly litre bottle for the lowest cost per dose in a multi-dog home. Whichever you choose, fresh oil, correct storage and the right dose matter more than the brand.
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