Can diet really make a difference?
For most dogs, diet alone will not control epilepsy - but it may reduce seizure frequency when used alongside medication. The evidence base is growing, and several vets now actively recommend dietary intervention as part of a broader management plan.
Always discuss any changes with your vet before introducing them, particularly if your dog is on medication, as some supplements can interact with AEDs.
MCT oil (medium-chain triglycerides)
MCT oil is the most studied dietary supplement for canine epilepsy. A multicentre randomised controlled trial (Berk et al. 2020) found that supplementing with MCT oil led to a statistically significant reduction in seizure frequency in dogs with idiopathic epilepsy - with some dogs showing a greater than 50% reduction.
MCTs are converted to ketones in the liver, which the brain can use as an alternative fuel source. Ketones have anti-convulsant properties - this is the same principle behind the ketogenic diet used in children with drug-resistant epilepsy.
- Dose: Typically 1–2 tablespoons per day for a medium-large dog, mixed into food. Start low and increase gradually to avoid digestive upset.
- Quality: Use food-grade MCT oil (C8/C10 fractions). Coconut oil contains MCTs but at lower concentrations.
- Timing: Results may take 3 months to become apparent.
Omega-3 fatty acids (fish oil)
Omega-3 fatty acids - particularly DHA and EPA from fish oil - have anti-inflammatory and neuroprotective properties. Some studies suggest they may help reduce neuroinflammation associated with epilepsy, though the evidence in dogs is less established than for MCT oil.
Fish oil is generally safe and widely available. Look for products specifically formulated for dogs, or human-grade fish oil capsules - the dose is typically based on your dog’s body weight. Ask your vet for guidance.
Dietary approaches
Medium-chain triglyceride (MCT) enriched diets
Some commercial dog foods are now formulated with elevated MCT content, targeting epileptic dogs. These can be a convenient alternative to adding MCT oil separately. Ask your vet about prescription options - brands like Royal Canin Veterinary Diet have products in this space.
Modified ketogenic diet
A high-fat, very low-carbohydrate diet that encourages ketone production. Evidence in humans with drug-resistant epilepsy is strong. In dogs, the research is limited but promising. This type of diet requires close veterinary supervision and is not suitable for all dogs.
Consistent diet and potassium bromide
If your dog is on potassium bromide, consistent salt intake is medically important - significant changes in dietary sodium affect how the drug is absorbed and excreted, potentially altering blood levels and seizure control. Do not change your dog’s diet without telling your vet.
Other supplements
Melatonin
Some owners report reduced nighttime seizures with melatonin supplementation. Evidence is anecdotal, and research in dogs is limited. Generally considered safe, but check with your vet on dose and suitability.
Vitamin B6 / Magnesium
Sometimes mentioned in epilepsy communities. Evidence in dogs is very limited. Excess vitamin B6 can be toxic - do not supplement without veterinary advice.
Things that can make it worse
- Rosemary - some evidence suggests it may lower the seizure threshold. Avoid foods with rosemary extract as a preservative.
- Erythritol and xylitol - toxic to dogs generally, but particularly relevant if your dog is on a modified diet.
- Large dietary changes without vet input - especially if on potassium bromide (see above).
Small changes, tracked carefully, add up. You’re doing right by your dog just by looking into this.