Feeding & Nutrition

A friend rang me at half eleven one night, sitting on her kitchen floor with a wet tea towel and a spaniel who had just come out of his second cluster in a month. He was pacing, blind and frantic, walking into the dishwasher. She had already been to the neurologist, the phenobarbital dose had been raised twice, and she asked me the question owners in that position almost always ask eventually: is there anything I can feed him?

For most of the conditions people ask that about, the honest answer is not really. Epilepsy is one of the rare exceptions where nutrition has had a genuine research upgrade over the past decade, and where a vet can point at randomised, blinded, placebo-controlled trial data in actual dogs rather than extrapolation from rodents.

The interesting molecule is the medium-chain triglyceride. Fats are classified by the length of their carbon chains, and medium-chain fats behave differently from the long-chain fats that make up most of the oil in a bowl of food. They are absorbed straight into the portal circulation, reach the liver quickly, and a portion is converted into ketone bodies even in an animal eating plenty of carbohydrate. The brain can burn ketones as fuel. Beyond that, one medium-chain fatty acid, decanoic acid, appears to act directly on receptors involved in the runaway electrical activity of a seizure. Neither mechanism is fully settled, and anyone who says otherwise has stopped reading.

What has been shown is more modest and more useful than the internet version. In trials of dogs with drug-resistant idiopathic epilepsy, adding an MCT-enriched diet on top of existing medication reduced seizure frequency in a meaningful proportion of them. A small number became seizure-free during the trial period. A larger group had a worthwhile drop. And a substantial number changed not at all. Some studies also picked up improvements in the behavioural side of epilepsy, the anxiety and the fear that so many of these dogs carry between episodes, which owners often notice before they notice anything about seizure counts.

Read that carefully, because the gap between those results and the way MCT gets discussed in owner groups is wide. This is an adjunct. It goes alongside anti-seizure medication, not instead of it. Nobody in the field is suggesting that a dog on phenobarbital or levetiracetam or imepitoin should come off it because there is coconut-scented oil on his kibble. Reducing or stopping an anti-seizure drug without veterinary supervision is one of the more dangerous things an owner can do, because abrupt withdrawal can trigger status epilepticus, and status epilepticus kills dogs.

The strict ketogenic diets used in children with refractory epilepsy do not transfer neatly either. Dogs metabolise fat differently and resist being pushed into deep ketosis by diet alone, which is why the canine work went down the MCT supplementation route rather than copying a human protocol. It is also why an owner improvising a high-fat home diet for an epileptic dog usually ends up with an unbalanced ration and a pancreatitis risk rather than a therapeutic effect.

If you and your vet decide to try it, the practical details matter more than the theory. There are complete diets formulated with MCT built in, and there are MCT oils and supplement products designed to be added to an existing food. The complete diet is the tidier option, because the rest of the ration has been rebalanced around the added fat. If you are adding oil to food yourself, the amount should be calculated against your dog's energy requirement by someone who has done the arithmetic, not guessed from a blog.

Start low and build up over a week or two, whatever the target. Medium-chain triglycerides taste greasy and plenty of dogs refuse the bowl on day one, which is easier to avoid if the first addition is barely detectable. The other limiting factor is the gut. Loose stools, wind and occasional vomiting are the usual reasons people abandon the attempt, and almost all of it comes from going too fast.

Then the calories, which is where a lot of good intentions come unstuck. Oil is the most energy-dense thing you can add to a bowl, and epileptic dogs on phenobarbital are frequently ravenous already because the drug drives appetite. Add fat without taking anything away and you will have a fat dog inside three months. Whatever goes in as oil comes out of the meal. Dogs with a history of pancreatitis or high blood lipids need a specific conversation with their vet first, and coconut oil is not a substitute, since it is only partly medium-chain and dominated by lauric acid, which behaves more like a long-chain fat in the body.

Timing is worth thinking about separately. Anti-seizure medication works on blood levels, and blood levels prefer routine, so twice-daily dosing at genuinely consistent hours does more good than most dietary tinkering. Giving tablets with food reduces the nausea that makes some dogs difficult about them. And there is one specific trap for dogs on potassium bromide: bromide and chloride compete for the same route out through the kidneys, so the amount of salt in the diet directly changes how much bromide the dog retains. Switch to a saltier food, start handing out salty human snacks, or move on to a prescription diet with a different sodium content, and serum bromide can drift far enough to break seizure control that had been stable for a year. That is not a theoretical risk. It is a recognised cause of breakthrough seizures, and it is entirely preventable by keeping the diet consistent and telling the vet before you change it.

Which is the real rule underneath all of this. Change one thing at a time, tell your vet or neurologist before you do it, and keep a seizure diary with dates, times, duration and what happened beforehand. Epilepsy waxes and wanes on its own, so a quiet six weeks after a change proves very little; most clinicians want three months of diary entries before calling anything a success. Owners also ask about CBD, and the fair answer is that early research exists, quality and legality vary enormously by country, and it interacts with the drugs your dog is already taking. That is a conversation for the consulting room, not the checkout.