[duskwuff]

This study doesn't establish that, no. But there is considerable anecdotal evidence of service animals that can alert well in advance of a seizure, before the patient is aware of any prodromal symptoms.

(For example: https://news.ycombinator.com/item?id=19522755)

[papermill]

That's interesting but how do we know it due to smell rather than sound or other senses? I've read that dogs and other animals can also anticipate earthquakes because they can hear or feel the earthquake earlier than humans.