Salmon oil is one of the easiest ways to add omega 3 fatty acids to your dog’s diet, but the most common question we hear from dog owners is simple: how much salmon oil for dogs is the right amount? Too little and you won’t see much difference. Too much salmon oil and you risk loose stools, an upset tummy and extra calories your four legged friend doesn’t need. This guide gives you a clear dosage chart by body weight, a five-day plan to introduce it, and the side effects to watch for.
Quick answer
- Dose by body weight: as a guide, 2–4 ml a day for a small dog (up to 10 kg), 6–8 ml for 11–25 kg, 8–10 ml for 26–45 kg and 10–14 ml for dogs over 45 kg.
- Start low: build up to the full daily dose over five days.
- Every day is fine: salmon oil is designed for daily use. Consistency is what brings results.
- Check with your vet first if your dog has a health condition, takes medication or has had pancreatitis.
How much salmon oil for dogs per day? Dosage chart
The right amount of salmon oil depends mainly on your dog’s body weight. Every product has a different strength, so always follow the recommended dosage on your bottle. For PawDoctor Scottish Salmon Oil, the feeding guide is:
| Dog’s body weight | Daily dose (ml) | Pumps per day | Example breeds |
|---|---|---|---|
| 1–10 kg | 2–4 ml | 1–2 pumps | Chihuahua, Jack Russell, Pug |
| 11–25 kg | 6–8 ml | 3–4 pumps | Cocker Spaniel, Staffie, Border Collie |
| 26–45 kg | 8–10 ml | 4–5 pumps | Labrador, Golden Retriever, German Shepherd |
| 45 kg+ | 10–14 ml | 5–7 pumps | Great Dane, Newfoundland, St Bernard |
Breeds are examples only. Weigh your dog if you can, as individual dogs vary a lot. If your dog sits between two bands, start at the lower amount.
EPA and DHA: why the daily dose depends on body weight
What actually matters is how much EPA and DHA your dog gets. These are the two long-chain omega 3 fatty acids, eicosapentaenoic acid and docosahexaenoic acid, behind most of the health benefits of salmon oil. Vets calculate these per kilogram of your dog’s body weight.
“Recommended doses of EPA and DHA supplements for therapeutic purposes range from 50 to 220 mg/kg body weight.”
The higher end of that range is used under vet supervision for conditions like osteoarthritis. For everyday support of healthy skin, a shiny coat and overall health, the amount on a pet salmon oil feeding guide is the place to start. The same article notes that the US National Research Council sets a safe upper limit for dogs of 280 mg EPA and DHA per 100 kcal of food. For a typical 20 kg dog that’s roughly 3,500 mg a day, well above what a normal daily dose of salmon oil provides.
Health benefits of the right dose
Many pet owners add salmon oil to their dog’s diet for its many benefits. Omega 3 fatty acids have natural anti inflammatory properties that help reduce inflammation in the skin and joints. Getting the dose right is how you get those anti inflammatory benefits without side effects:
- Skin and coat: support for healthy skin, dry skin and some types of skin disease, plus better coat condition.
- Joints: anti inflammatory effects that can ease joint stiffness in many dogs, especially seniors.
- Heart health, brain health and the immune system: EPA and DHA combined support all three as part of your dog’s health overall.
Salmon oil is a source of healthy fats, and like all fats it also helps with fat soluble vitamin absorption from your pet’s food. That’s one more reason to give it with a meal.
Worked examples
- A small dog, 8 kg (e.g. a Jack Russell): 1–2 pumps (2–4 ml) once a day, stirred into dog food.
- A 30 kg Labrador: 4–5 pumps (8–10 ml) a day. Labradors are prone to weight gain, so keep an eye on the extra calories.
- A 50 kg Great Dane: 5–7 pumps (10–14 ml) a day, split between two meals if your dog has a sensitive stomach.
How to introduce salmon oil: a five-day plan
Adding salmon oil too fast is the most common reason for gastrointestinal upset. Our feeding guide recommends introducing it gradually over five days and making sure fresh drinking water is always available.
| Day | Amount | What to look for |
|---|---|---|
| Day 1 | About ¼ of the full dose | Normal stools, eating as usual |
| Day 2 | About ¼ to ½ | Any loose stools? Hold here a day |
| Day 3 | About ½ | Settled tummy |
| Day 4 | About ¾ | Still happy and normal |
| Day 5 | Full daily dose | Keep going every day |
For a small dog where the full dose is just one pump, simply give one pump every other day for the first few days, then daily.
Can dogs have salmon oil every day?
Yes. Salmon oil works best as a daily habit, not an occasional treat. Omega 3s are built up gradually in the body’s cell membranes, so giving salmon oil every day at a steady amount is what leads to visible changes in coat condition and itchy skin. Many pet parents find a Subscribe & Save plan is the easiest way to never run out.
How soon will you see a difference? Vets at VCA Animal Hospitals say fish oil “may take several weeks before full effects are seen”. Many owners notice a softer coat in two to four weeks and less scratching by six to eight weeks. Read more about the health benefits of salmon oil for dogs and what to expect month by month.
Salmon oil side effects for dogs
Salmon oil is generally well tolerated by healthy dogs. Most side effects of salmon oil for dogs are mild and linked to giving too much, too fast.
| Side effect | Why it happens | What to do |
|---|---|---|
| Loose stools or diarrhoea | Too much oil, too quickly | Drop back to the last amount that suited them and build up more slowly |
| Vomiting or a sensitive stomach | Oil on an empty stomach | Always give with a meal; split the daily dose |
| Fishy breath or skin odour | Very high doses | Check you’re within the feeding guide |
| Oily coat or skin flaking | Excess oil | Reduce the amount |
| Weight gain | Extra calories (about 40 kcal per 5 ml) | Reduce food slightly or the dose |
| Bruising or bleeding | Omega 3s affect clotting at high doses | Stop and call your vet |
Is too much salmon oil bad for dogs?
It can be. Beyond tummy upsets, veterinary nutritionists list altered platelet function, slower wound healing, weight gain and interactions with medication among the potential adverse effects of very high fish oil intake. Large amounts of oil also add extra calories. A teaspoon is around 40 calories, which is significant for a small dog. A few other points to know:
- Vitamin D and vitamin A: pure salmon oil is different from cod liver oil, which is much higher in these fat soluble vitamins. Don’t swap one for the other at the same dose.
- Vitamin E: omega 3s increase the body’s need for antioxidants like vitamin E. Most complete dog foods contain it, but mention it to your vet if you feed a home-made diet.
- Freshness: oxidised (rancid) oil loses its benefits. Store the bottle somewhere cool and dark, close the pump after use, and use it within the time on the label.
Dogs that should see a vet before giving salmon oil
Not all dogs should start salmon oil without advice. Talk to your vet about your dog’s current health status first if they:
- have had pancreatitis or have a very sensitive stomach
- take blood thinners, NSAID pain relief (such as meloxicam or carprofen) or other medicines
- have a clotting disorder or are due to have surgery
- have kidney disease, heart disease or diabetes, as your vet may want a specific dose
- are pregnant or nursing
- are overweight or on a weight-loss plan
Your vet can also check whether your dog’s food already contains added fish oil, so you’re not doubling up.
Puppies, senior dogs and small dogs
Puppies: DHA supports brain development and eye health, and salmon oil is suitable for puppies. Dose by their current weight and increase as they grow. Puppy foods often contain added DHA already.
Senior dogs: older dogs are among those most likely to benefit, thanks to joint support and possible help with cognitive function. Weigh them regularly, as less activity means the extra calories add up faster.
Small dogs: one pump can be a full day’s amount, so measure carefully and don’t add “a splash” by eye.
Liquid form or capsules? And does cold pressed matter?
Salmon oil in liquid form is the easiest to dose by weight and most dogs eat it happily on their food. Capsules suit some owners but are harder to split for a small dog. You’ll also see “cold pressed” on some labels. It describes oil extracted without high heat. Whatever the method, the key things are a single, traceable ingredient, a sealed bottle and a clear feeding guide.
Dog food, fatty acids and a balanced diet: do dog owners need to add salmon oil?
Think of salmon oil as a top-up to a complete and balanced diet, not a replacement for one. A good-quality dog food covers the essentials, and salmon oil supplements raise omega 3 fatty acids for skin, coat and joint support. Can salmon oil help if your dog already eats a well-designed food? For many dogs, yes, because most dry foods contain modest omega 3 levels. Stir it into wet food or kibble to keep your dog’s diet balanced, and count it as part of their daily calories. Getting your pet’s health right is about the whole bowl, not one ingredient. If you feed home-cooked meals, ask your vet or a veterinary nutritionist to check the whole diet is balanced.
Cognitive function and older dogs
DHA supports brain health and cognitive function, which is why some owners of older dogs add salmon oil. Dose it the same way, by weight.
Frequently asked questions
How much salmon oil should a dog have a day?
As a guide: 2–4 ml for dogs up to 10 kg, 6–8 ml for 11–25 kg, 8–10 ml for 26–45 kg and 10–14 ml for dogs over 45 kg. Always check the label on your product.
How often can I give my dog salmon oil?
Once a day with food. You can split the daily dose between two meals if your dog has a sensitive stomach.
Can fish oil cause diarrhoea in dogs?
Yes, especially if the dose is too high or increased too quickly. Reduce the amount and build up again over several days.
How do I know if I’m giving my dog too much fish oil?
Signs include loose stools, vomiting, fishy breath, an oily coat and weight gain. Bruising or bleeding is rare but serious: stop and call your vet.
Are dogs allergic to salmon oil?
True allergy is uncommon, but dogs with a fish allergy should avoid it. Watch for itching, swelling or tummy upset after starting.
How many calories are in salmon oil for dogs?
Like all oils, roughly 9 calories per gram, which works out at about 40 calories per 5 ml teaspoon.
We hope you found this article helpful. Ready to start? Shop PawDoctor Scottish Salmon Oil, browse our supplements, or read our guide to salmon oil for cats.
Sources
- Raditic D, Gaylord L. Fish Oil Dosing in Pet Diets and Supplements. Today’s Veterinary Practice, 2020.
- Hyland K, Gollakner R. Fish Oil. VCA Animal Hospitals.
- Eldredge D. Is Salmon Oil Good for Dogs? Whole Dog Journal, 2023.
- PawDoctor Scottish Salmon Oil feeding guide (bottle label).
