Most people think of salmon oil as a dog supplement, but cats can benefit just as much. Salmon oil for cats is a simple way to add omega 3 fatty acids to your cat’s diet, supporting healthy skin, a glossy coat, comfortable joints and more. Here’s what the evidence says, how much to give, and how to get even the fussiest cat to accept it.
Key takeaways
- Is salmon oil good for cats? Yes, for most healthy cats. It’s a natural source of EPA and DHA, the omega 3s with anti inflammatory properties.
- The main benefits of salmon oil for cats are skin and coat health, joint support for senior cats, and support alongside vet care for conditions like kidney disease.
- Cats need much less than dogs. Start small, mix it into food and follow veterinary guidance on the amount.
- Watch for loose stools, a fishy odour on the breath and weight gain in overweight cats.
What is salmon oil, and does salmon oil help cats?
Salmon oil is the natural oil from salmon, an oily fish rich in essential fatty acids. The two that matter most are EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). Cats are poor at making these from plant oils, so getting them from fish is the most efficient route.
Omega 3s become part of the cell membranes throughout the body, from the skin barrier to the joints, brain and eyes. That’s why one ingredient can have such wide-ranging effects on your cat’s health. Our PawDoctor Scottish Salmon Oil is 100% salmon oil and is made for both dogs and cats.
Benefits of salmon oil for cats
Healthy skin and coat condition
Dry skin, flaky skin and a dull, greasy or scruffy coat are common in cats, especially older cats who groom less. Omega 3s help support a healthy skin barrier that holds in moisture. Many owners notice a softer, shinier coat and less dandruff within a few weeks. Vets also use fish oil alongside other treatment for cats with skin allergies and itchy skin.
Anti inflammatory effects for joints and senior cats
Arthritis in cats is very common but often missed, because cats hide stiffness well. Look for reluctance to jump, missing the litter tray or grooming less. EPA’s anti inflammatory effects can help support comfortable movement. In a review for Today’s Veterinary Practice, veterinary nutritionists estimated around 120 mg/kg of combined EPA and DHA a day in studies of cats with osteoarthritis. That’s a therapeutic level to agree with your vet, not a starting dose.
Kidney support
Kidney disease is one of the most common conditions in older cats. Omega 3s are included in many veterinary kidney diets, and vets use fish oil as part of managing it. If your cat has a kidney diagnosis, always get veterinary advice before adding salmon oil, as your vet will want to factor it into their diet.
Brain health, DHA and eye development
DHA is a key building block of the brain and retina. It’s added to many kitten foods to support brain and eye development, and it may help support a healthy brain as cats age.
Digestive health and inflammatory bowel disease
Vets sometimes use omega 3s as part of the management of inflammatory bowel disease (IBD) in cats. It’s an area to discuss with your vet, not one to treat at home.
“This medication may take several weeks before full effects are seen.”
How much salmon oil for cats?
Cats need far less salmon oil than dogs. The right amount depends on your cat’s size, weight and health. Always follow the label on your product and ask your vet for a specific amount if your cat has a health condition.
- Start small: begin with a small fraction of the full amount, mixed into wet food.
- Build up over a week: going slowly helps avoid digestive issues like loose stools.
- Dose by your cat’s weight: a 3 kg cat needs less than a 6 kg cat.
- Once a day: consistent daily use matters more than the amount.
Our full salmon oil dosage guide explains why vets calculate omega 3s by body weight. The same principle applies to cats.
How to add salmon oil to your cat’s diet
Cats can be suspicious of anything new in the bowl. These tips help:
- Mix it into wet food: it blends in better than on dry kibble, where the oil can sit on top.
- Start tiny: a little goes a long way, and a small amount is less likely to be noticed.
- Use their favourite meal: add it to the food they’re most excited about.
- Be patient: most cats love the taste of salmon once they’re used to it.
Salmon oil vs other omega 3 sources for cats
| Source | EPA & DHA | Notes for cats |
|---|---|---|
| Salmon oil | Rich | Tasty to most cats; easy to mix into food |
| General fish oil | Varies | Similar benefits; check the strength and freshness |
| Cod liver oil | Moderate | High in vitamin A and D. Easy to overdo, so not for daily use without vet advice |
| Krill oil | Moderate | Small doses; more expensive |
| Green lipped mussel | Some | Often used for joint support |
| Whole fish (e.g. salmon) | Some | Fine as an occasional cooked treat, not a reliable daily source |
Many cat foods already contain some fish oil, so check the label to avoid doubling up.
Is salmon oil safe for cats? Side effects to watch for
Salmon oil is generally safe for healthy cats at sensible amounts. Possible side effects include:
- Loose stools or digestive issues: usually from too much, too fast.
- Fishy odour on the breath or coat.
- Weight gain: oil is calorie-dense, which matters for overweight cats. Keep an eye on your cat’s weight.
- Bruising or bleeding: VCA vets highlight this as a sign to stop and call your vet, “especially in cats”.
Speak to your vet first if your cat takes medication (especially blood thinners or anti-inflammatories), has a clotting problem, is due for surgery, or has been diagnosed with kidney disease, diabetes or pancreatitis.
Omega 3s also increase the body’s need for antioxidants like vitamin E. Complete cat foods usually contain enough, but it’s worth mentioning to your vet if you feed a home-made diet.
Choosing a salmon oil for cats: does cold pressed or wild caught matter?
You’ll see labels like “cold pressed” and “wild caught”. More important is a single ingredient with nothing added, a traceable source, a sealed pump to keep the oil fresh, and a clear feeding guide. Store the bottle somewhere cool and dark so it doesn’t oxidise.
PawDoctor Scottish Salmon Oil is 100% salmon oil in a 1 litre pump bottle, made in the UK and suitable for cats, dogs and puppies. It’s ideal if you have a multi-pet home. Save on every bottle with Subscribe & Save.
Frequently asked questions
Do vets recommend salmon oil for cats?
Many vets recommend omega 3 supplements for cats, particularly for skin, coat, joints and kidney support. Ask your own vet if your cat has a health condition.
Can I give my cat salmon oil every day?
Yes. Salmon oil is designed for daily use at the right amount for your cat’s weight.
How long does it take for salmon oil to work on cats?
Vets say several weeks. Coat changes often show in two to four weeks, and joint support builds over two to three months.
What happens if I give my cat too much salmon oil?
The most common signs are loose stools, vomiting, a fishy odour and weight gain. Reduce the amount. If you see bruising or bleeding, stop and call your vet.
What is the healthiest oil for cats?
Oils rich in EPA and DHA, such as salmon oil and other fish oils, are the most useful for cats. Plant oils don’t provide EPA or DHA in a form cats can use well.
Is salmon oil better for cats than eating salmon?
Cooked salmon is fine as an occasional treat, but salmon oil gives a consistent daily amount of omega 3s without upsetting your cat’s balanced diet.
Got a dog too? Read our guides to the benefits of salmon oil for dogs and how much salmon oil to give dogs, or browse all supplements.
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.
