The most effective treatments for dog seizures are prescription anticonvulsant medications, with phenobarbital, potassium bromide, zonisamide, and levetiracetam (Keppra) all considered strong first-line options. The right choice depends on your dog’s seizure frequency, overall health, and how well they tolerate a given drug. No over-the-counter product reliably stops or prevents seizures, so working with a veterinarian is essential.
What to Do During a Seizure
When your dog is actively seizing, the most important thing you can give them is a safe environment. Move furniture and hard objects out of the way, keep your hands away from their mouth (dogs don’t swallow their tongues), and gently slide them away from stairs or ledges if needed. Start timing the seizure immediately. Most seizures last under two minutes and resolve on their own.
If your vet has prescribed a rescue medication, this is when you use it. The two main at-home options are rectal diazepam (Valium) and intranasal midazolam, a similar fast-acting sedative applied inside the nostrils. Both work within minutes to interrupt prolonged seizures. These are prescription medications your vet dispenses in advance specifically for emergencies.
A seizure lasting more than five minutes, or two or more seizures within five minutes without your dog returning to normal in between, is called status epilepticus. This is a medical emergency. After three seizures within 24 hours, your dog needs hospital-level care with intravenous medication.
Daily Anticonvulsant Medications
Long-term seizure management relies on daily oral medications. Your vet will typically start with one drug, then adjust or add a second if seizures aren’t adequately controlled.
Phenobarbital has been a standard treatment for decades. It’s effective and inexpensive, but it requires regular blood monitoring. Levels are typically checked two to three weeks after starting the drug or changing the dose, then every six to twelve months once your dog is stable. Because phenobarbital is processed by the liver, your vet will also monitor liver values over time. Common side effects include increased thirst, hunger, and drowsiness, especially in the first few weeks.
Potassium bromide is often used alongside phenobarbital or on its own for dogs with liver concerns, since it’s eliminated through the kidneys instead. It takes longer to reach full effect in the body, sometimes several months, so your vet may “load” a higher dose upfront.
Zonisamide and levetiracetam have become increasingly popular because they work well with minimal side effects. Levetiracetam is frequently used as a second medication when one drug alone isn’t enough. The standard form needs to be given three to four times per day, which can be challenging, but an extended-release version allows twice-daily dosing. If seizures continue, the dose can be increased in increments until control improves.
Topiramate is another option your vet may consider, particularly for dogs whose seizures don’t respond well to the drugs listed above.
CBD and Hemp Extracts
CBD oil is the supplement with the most research behind it for canine seizures, though it’s not a replacement for prescription medication. A meta-analysis of observational studies found that CBD-rich hemp products reduced seizure frequency by 50% or more in roughly 35 to 40% of dogs. These results came from dogs already taking standard anticonvulsant medications, meaning CBD was used as an add-on, not a standalone treatment.
A randomized clinical trial using a CBD/CBDA-rich hemp extract at 2 mg/kg twice daily showed meaningful seizure reduction with minimal side effects. The most common issues were mild drowsiness and temporary unsteadiness, at rates not significantly different from placebo. Notably, hemp extracts containing a full spectrum of cannabinoids appeared effective at much lower doses (around 6 mg/kg per day) compared to purified CBD isolates (around 25 mg/kg per day).
If you’re considering CBD, look for products specifically formulated for pets with third-party lab testing, and let your vet know. CBD can interact with other medications your dog is taking, particularly phenobarbital, by affecting how the liver processes drugs.
Dietary Approaches
What your dog eats can influence seizure activity. The most studied dietary strategy is supplementation with medium-chain triglyceride (MCT) oil. MCTs are a type of fat that the body converts into ketones, an alternative energy source for the brain. In one clinical trial of dogs with idiopathic epilepsy, 30% of dogs receiving an MCT-enriched diet experienced a 50% or greater reduction in seizure frequency. The remaining dogs showed more variable responses, with some seeing modest improvement and others no change.
Ketogenic diets, which are high in fat and very low in carbohydrate, aim to keep the brain running on ketones rather than glucose. This approach is well established in human epilepsy and is being adapted for dogs. The proposed mechanism involves changes in how brain cells fire, essentially making them less excitable and less likely to trigger a seizure cascade. MCT-based diets are a modified version of this concept, allowing slightly more carbohydrate while still producing ketones.
There’s also preliminary evidence that hypoallergenic or elimination diets may help some dogs. In a small retrospective study, seven out of eight dogs experienced fewer and less severe seizures after switching to an exclusion diet. The theory is that food sensitivities may contribute to inflammation that lowers the seizure threshold in certain dogs. This isn’t a universal treatment, but it may be worth exploring if your dog has concurrent digestive or skin issues.
What Ongoing Treatment Looks Like
Seizure management in dogs is rarely a one-and-done process. Most dogs with epilepsy need medication for life, and finding the right drug or combination takes time. Your vet will adjust doses based on how often seizures occur, how severe they are, and what side effects your dog experiences. The goal for most dogs isn’t zero seizures but rather reducing their frequency and intensity to a level that preserves quality of life.
Blood work is a regular part of the process, especially for dogs on phenobarbital. Samples are typically drawn at peak and trough levels (about two hours after a dose and just before the next one) to make sure the drug stays in a therapeutic range. Once stable, these checks move to every six to twelve months.
Keeping a seizure diary helps enormously. Record the date, time, duration, and any unusual behavior before or after each event. This log gives your vet the data they need to decide whether the current plan is working or needs adjustment. Many owners also find it helpful to video seizures on their phone, since different seizure types can point to different underlying causes and may respond to different treatments.