CBD for Dogs With Seizures: What the Research Shows
This is a question many worried owners ask, so here is the honest, careful answer: research into CBD for canine seizures is early and promising, but it has only been studied as an add-on to standard epilepsy medication, under veterinary supervision – not as a standalone treatment. CBD is not an approved seizure medication for dogs, it can interact with the drugs that control seizures, and it should never be used to replace medication your veterinarian has prescribed. If your dog has seizures, the most important step is to work with your vet. This page explains what the studies show so you can have an informed conversation.
Quick answer
Research on CBD for canine seizures is still limited, and CBD has only been studied as an add-on to standard epilepsy medication under veterinary supervision, never as a standalone treatment. Do not stop, reduce, or replace prescribed seizure medication. If you are considering CBD for a dog with seizures, make that decision with your veterinarian.
First, the safety essentials
- Never stop or reduce prescribed seizure medication to try CBD. Stopping anticonvulsants can trigger severe, even life-threatening seizures.
- CBD interacts with common seizure drugs. It can change the blood levels of medications like phenobarbital, which is exactly why this must be managed by your vet with monitoring, not done on your own.
- A cluster of seizures, or a seizure lasting more than a few minutes, is an emergency. Go to a veterinarian immediately.
| Rule | Why |
|---|---|
| Never stop or reduce prescribed seizure medication to try CBD | Stopping anticonvulsants can trigger severe, even life-threatening seizures |
| Any CBD trial must be managed by your veterinarian | CBD can change the blood levels of seizure drugs such as phenobarbital, so doses and bloodwork need monitoring |
| A cluster of seizures, or one lasting more than a few minutes, is an emergency | Go to a veterinarian immediately |
What the research actually shows
Early controlled studies are encouraging but limited. Work at Colorado State University, among others, looked at CBD added to standard treatment in dogs with hard-to-control epilepsy and found that many dogs had a reduction in seizure frequency compared with placebo, particularly as an adjunct to their existing medication. The picture in people is part of why this is studied at all: a purified CBD drug (Epidiolex) is FDA-approved for certain rare human epilepsies – but that is a regulated pharmaceutical for people, not an over-the-counter pet supplement, and the two should not be confused.
The honest summary: the evidence suggests CBD may help some dogs as an add-on, the studies are still small, and it is not a proven or approved seizure treatment on its own. More research is underway.
Why this has to be a veterinary decision
Seizure management is precise work. Drug levels are monitored with bloodwork, doses are adjusted carefully, and anything that changes how those drugs behave – including CBD – has to be accounted for. A veterinarian (or a veterinary neurologist) can decide whether a trial of CBD makes sense for your dog, choose a quality product, set the dose, and monitor liver values and drug levels along the way. That is not something to improvise at home, which is why we do not publish a seizure dose here.
If you want to ask your vet about it
Bring a seizure log (dates, length, what happened before and after), a list of current medications and doses, and the certificate of analysis for any CBD product you are considering. Ask specifically about interactions with your dog’s current medication and what monitoring they would recommend. For general background on CBD safety and quality, see is CBD safe for dogs and our buyer’s guide.
References and further reading
- McGrath S, et al. Randomized controlled trial of cannabidiol as an add-on to antiepileptic treatment in dogs with intractable idiopathic epilepsy. JAVMA (2019).
- U.S. Food and Drug Administration. What you need to know about products containing cannabis or CBD.
- American Veterinary Medical Association. Cannabis use and pets.
Frequently asked questions
Can CBD stop seizures in dogs?
No one should rely on CBD to stop seizures. Research suggests it may reduce seizure frequency in some dogs when added to standard medication under veterinary care, but it is not an approved or standalone seizure treatment and does not replace prescribed anticonvulsants.
Can I give my dog CBD with phenobarbital or other seizure medication?
Only under veterinary supervision. CBD can change the blood levels of seizure drugs, so combining them requires your vet’s guidance and monitoring.
How much CBD for a dog with seizures?
There is no safe do-it-yourself dose for seizures – this must be set and monitored by your veterinarian, because of the drug interactions and the stakes involved.
Is CBD FDA-approved for dog seizures?
No. A purified CBD drug is approved for certain human epilepsies, but there is no FDA-approved CBD seizure medication for dogs. Pet CBD is sold as a supplement.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is educational and is not a substitute for veterinary advice. Never change your dog’s seizure medication without your veterinarian.
This guide is educational and is not a substitute for veterinary diagnosis or care. If you are worried about your pet, talk to your veterinarian.