My Airedale has epilepsy....she's 9 and has had this since she was a year old. She takes potassium bromide, which controlled her seizures until she was about 7 years old. Then we reached the dose limit and I didn't want to add phenobarbital...so my vet suggested we add CBD oil. The effect was immediate. It was seriously amazing. She does occasionally have a seizure, but far, far fewer. And when she does, the CBD also helps with her post-seizure hyper behavior.