Comment by anfractuosity

This sounds rather fascinating - https://www.scientificamerican.com/article/dogs-detect-the-s... using trained dogs to detect seizures via smell.

I assume there must be researchers trying to do this electronically too (See - https://newsreleases.sandia.gov/seizure_sensor/ for example.). It might not be practical yet unfortunately though, and not sure if it would translate to animals.

Good luck in finding a solution though! I would assume something like an accelerometer on their collar might be able to detect shaking.