[HeyLaughingBoy]

A lot of speculation in this thread!

Yes, it's possible, but it would be difficult to do on your own if only because you can't (won't ethically) induce seizures at will so testing will be hard.

My suggestion would be to try to find research into this. There are many medical devices for humans that have found use in animal applications and I'm sure that seizure detection is a well-researched field.

It may not be difficult to copy a researcher's work. You'd be surprised to learn how simple most medical devices are at their core (I've been in the field for 20 years): it's the surrounding safety and predictability requirements that tend to make them complex and expensive.