Medium-chain triglyceride (MCT) supplementation is the best-supported dietary intervention for canine idiopathic epilepsy (IE), with consistent reductions in seizure frequency across multiple trials when added as an adjunct to antiseizure drug (ASD) therapy.

MCT oil supplemented at 9% of metabolic energy added to the base diet reduces median seizure frequency and seizure-day frequency compared to control oil. In one crossover trial, median seizure frequency was 2.51/month on MCT versus 2.67/month on control (P = .02), and seizure-day frequency was 1.68/month versus 1.99/month (P = .01); 2 dogs achieved complete seizure freedom, 3 had ≥50% reduction, and 12 had <50% reduction, while 11 showed no change or worsening.Journal of Vete… A separate field trial using a commercially available diet enriched with 6.5% MCT oil demonstrated a 32% decrease in mean monthly seizure frequency (P = 0.04) and a 42% decline in seizure days per month (P < 0.001) compared to baseline.Veterinary Reco… Quality of life remained very good to excellent (>8.5/10) in 20 of 21 dogs throughout that trial.Veterinary Reco…

MCT supplementation is appropriate for drug-resistant dogs with ≥3 seizures in the preceding 3 months, aged 6 months to 12 years, and weighing 4–65 kg, provided they have unremarkable interictal neurological examinations and no clinically significant laboratory findings.BMC Veterinary… Dogs already receiving an oil supplement or drugs that could influence MCT metabolism should be excluded or have their ASD adjusted before starting.Journal of Vete… The pharmacokinetic properties of ASDs — including efficacy, absorption, and clearance — can be influenced by dietary supplements, and MCT use should be actively monitored by the treating veterinarian.Research in Vet…

Omega-3 fatty acid supplementation has not demonstrated consistent benefit in dogs with IE. A single case report described reduced seizure frequency in a 2-year-old Great Dane receiving fish oil at 2 g/day, though the dose rationale, fish oil type, and specific EPA/DHA concentrations were not reported.Journal of the… A crossover trial using approximately 115 mg of EPA plus DHA per kg of body weight to the power of 0.75 failed to reduce seizure frequency or severity over 12 weeks.Journal of the… Dosing guidelines for omega-3 supplementation in canine IE have not been established.Journal of the…

Probiotic supplementation with dog-specific Lactobacillaceae strains shows preliminary benefit, particularly in drug-sensitive epilepsy. Complete seizure freedom was achieved in drug-sensitive dogs during a 3-month supplementation period, and the beneficial effect appeared to persist beyond the administration period.Research in Vet… Drug-refractory dogs showed a significant reduction in gut microbiota β-diversity but did not achieve seizure freedom.Research in Vet… Dogs with IE exhibit dysbiosis with reduced bacterial diversity, loss of beneficial genera, and overgrowth of opportunistic pathogens, supporting the gut–brain axis as a plausible therapeutic target.Animal Microbio…

Trace element status is altered in epileptic dogs, with dogs with IE showing higher hair copper, zinc, selenium, and arsenic, and lower hair phosphorus compared to healthy controls; both treated and untreated epileptic dogs had significantly lower hair phosphorus.Journal of Vete… Whether correcting these alterations reduces seizure frequency in dogs has not been established in the provided veterinary literature, though rebalancing selenium and zinc has been associated with seizure reduction in humans with epilepsy.Journal of Vete…

Owner uptake of dietary modification is high and should be incorporated into clinical monitoring. Over two-thirds of owners (67.7%) changed their dog's diet after an IE diagnosis, and nearly half (45.8%) reported giving dietary supplements, with coconut oil or MCT oil being the most common (71.3% of supplement users).Research in Vet…+1 Owner-reported motivations included improvement of seizure frequency (88.2%), seizure severity (61.8%), and protection from ASD side effects (62.5%).Research in Vet…

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