CBD oil for dogs with seizures and epilepsy

What does the research say about CBD oil for dog seizures?

Multiple clinical trials have tested cannabidiol as add-on therapy for dogs with epilepsy that does not respond fully to conventional medication. Results vary, and a 2025 systematic review concluded that study quality issues limit what can be concluded.

The 2019 trial published in the Journal of the American Veterinary Medical Association enrolled 26 dogs with intractable idiopathic epilepsy. Nine dogs received CBD at 2.5 mg/kg orally twice daily alongside their existing antiepileptic drugs, while seven received a placebo. The CBD group experienced a 33% median reduction in seizure frequency over the 12-week trial period.

A larger 2023 crossover study tested 51 dogs. Researchers first administered 5 mg/kg per day, then increased the dose to 9 mg/kg per day in dogs that continued after meeting futility criteria. The study found no significant difference in responder rates, defined as a 50% or greater reduction in seizure frequency, between dogs receiving CBD and those receiving placebo.

A 2025 exploratory study from Thailand enrolled 13 dogs using a titration protocol. The researchers started at 0.5 mg/kg twice daily and increased to 2.5 mg/kg every 12 hours, reporting a 24% median reduction in seizure frequency.

A 2025 systematic review examined three randomized controlled trials and concluded that moderate-to-high risk of bias in the existing literature limits recommendations about CBD use for canine epilepsy. The reviewers called for larger, higher-quality trials.

How does CBD work for seizures in dogs?

Cannabidiol is one of many compounds found in hemp and cannabis plants. The exact mechanism by which CBD may reduce seizure activity is not fully understood, even in human medicine where it has been studied more extensively.

Researchers believe CBD interacts with the endocannabinoid system, a network of receptors present in the brain and throughout the body that helps regulate various physiological processes. CBD may also act on serotonin receptors and other signaling pathways involved in neuronal excitability.

In the canine trials, CBD was always administered as an adjunct to conventional antiepileptic drugs such as phenobarbital or potassium bromide. The trials tested whether adding CBD could reduce seizure frequency in dogs whose epilepsy remained poorly controlled despite standard medication.

What side effects occur in dogs taking CBD for seizures?

Elevated alkaline phosphatase, a liver enzyme, is the most consistent adverse effect reported across multiple studies. Approximately 50% of dogs receiving CBD showed increased ALP levels, which is why regular veterinary monitoring with blood work is necessary.

Some dogs experienced ataxia, an unsteady gait or loss of coordination. In some trials, ataxia was severe enough that owners withdrew their dogs from the study. Vomiting and decreased appetite were also reported, though these occurred less frequently.

A 2022 review article published in The Veterinary Journal noted that while CBD appears generally well tolerated at the doses tested, long-term safety data in dogs remains limited. Liver enzyme monitoring is recommended for any dog receiving CBD alongside antiepileptic medication.

Is CBD safe to use with my dog's current seizure medication?

All published trials tested CBD in dogs already receiving conventional antiepileptic drugs. Drug interactions are possible. CBD is metabolized by liver enzymes that also process many antiepileptic medications, which may affect blood levels of those drugs. This is another reason regular veterinary monitoring is necessary when CBD is added to a plan.

Talk to your vet before adding CBD to your dog's regimen. Your vet can assess whether CBD is appropriate given your dog's specific medications, seizure pattern, and overall health, and can establish a monitoring schedule for liver enzymes and drug levels.

How much CBD oil is used for seizures in dogs?

Published studies tested a range of doses and protocols. The 2019 JAVMA trial used 2.5 mg/kg orally twice daily, for a total daily dose of 5 mg/kg. The 2023 crossover study tested 5 mg/kg per day initially, then increased to 9 mg/kg per day in dogs that continued. The 2025 Thai study used a gradual titration starting at 0.5 mg/kg twice daily and increasing to 2.5 mg/kg every 12 hours based on response and tolerance.

All trials administered CBD as an oil or extract, given orally. All trials used CBD as add-on therapy to existing antiepileptic medication.

Talk to your vet to determine an appropriate starting dose and schedule for your dog. Dosing should be individualized based on your dog's weight, seizure frequency, current medications, and response. Regular follow-up is necessary to assess efficacy and monitor for side effects.

What is idiopathic epilepsy in dogs?

Idiopathic epilepsy is recurrent seizure activity with no identifiable underlying cause such as a brain tumor, infection, or metabolic disorder. According to the International Veterinary Epilepsy Task Force, it is the most common form of epilepsy in dogs and affects approximately 0.6% to 0.75% of the general dog population.

Certain breeds show higher prevalence, including Border Collies, Australian Shepherds, Labrador Retrievers, and Belgian Tervurens. Seizures typically begin between six months and six years of age.

Diagnosis requires ruling out other causes through blood work, urinalysis, and often advanced imaging such as MRI. Conventional options typically involve antiepileptic drugs such as phenobarbital, potassium bromide, or levetiracetam. Some dogs achieve good seizure control on medication, while others continue to experience frequent seizures despite standard approaches. These cases are described as drug-resistant or refractory epilepsy, and they are the population tested in CBD trials.

When should I call my vet about my dog's seizures?

See your vet immediately if your dog experiences a seizure for the first time, if a seizure lasts longer than five minutes, or if your dog has multiple seizures in a 24-hour period. Prolonged seizures and cluster seizures are medical emergencies.

Call your vet if your dog's seizure pattern changes, such as increased frequency or longer duration, or if your dog does not return to normal behavior within a few hours after a seizure.

Regular veterinary follow-up is necessary for any dog with epilepsy. Your vet will monitor seizure frequency, assess medication effectiveness, and perform periodic blood work to check liver and kidney function and drug levels. If you are considering adding CBD to your dog's plan, discuss it with your vet before starting, and arrange a monitoring schedule that includes liver enzyme testing.

What is the difference between CBD and THC for dogs?

CBD and THC are both compounds found in cannabis and hemp plants, but they have very different effects and safety profiles in dogs.

THC, tetrahydrocannabinol, is the psychoactive compound responsible for the high associated with marijuana. Dogs have a higher concentration of cannabinoid receptors in their brains than humans do, which makes them more sensitive to THC. THC toxicity in dogs can cause severe symptoms including ataxia, urinary incontinence, drooling, vomiting, tremors, and in severe cases, seizures or coma.

CBD, cannabidiol, is non-intoxicating and does not produce a high. Hemp-derived CBD products intended for pets are formulated to contain minimal or no THC. The clinical trials testing CBD for canine epilepsy used CBD extracts with negligible THC content.

If your dog ingests marijuana or a THC-containing product, contact your vet or an emergency veterinary clinic immediately. THC toxicity is a medical emergency and requires prompt supportive care.

What should I look for in a CBD product for my dog?

Look for products specifically formulated for pets, derived from hemp, and accompanied by a certificate of analysis from an independent laboratory. The certificate should confirm the CBD content and verify that THC levels are within legal limits, typically below 0.3%.

The clinical trials used CBD oil or extract administered orally. Dosing precision matters when managing a condition as serious as epilepsy, so a product with clear labeling and a measured dropper or syringe is important.

Because CBD products for pets are not currently regulated by the FDA, quality and consistency vary. Third-party testing helps verify that the product contains what the label claims and is free from contaminants such as heavy metals, pesticides, and residual solvents.

Talk to your vet before selecting a product. Your vet can help you evaluate options and choose a product appropriate for your dog's weight, seizure management plan, and overall health.

Can I use CBD oil for seizures in cats?

The research reviewed here is specific to dogs. No comparable clinical trials have tested CBD for seizure management in cats, and feline epilepsy differs in important ways from canine epilepsy.

Cats metabolize many compounds differently than dogs do, and products safe for dogs are not automatically safe for cats. If your cat has seizures, work with your veterinarian to establish a diagnosis and care plan. Do not give your cat a CBD product formulated for dogs without veterinary guidance.