This can happen to rats if they are poisoned (which is why we prefer more humane methods to rid wild rats from a home!), or if the rat’s breeding line has epilepsy in it (why we don’t encourage random breeding).
What do I do?
Move the rat to a small confinement that is filled with soft bedding. Leave out the food and water for the time being. Be extra careful when handling your rat in a seizure as they can accidentally bite you and you don’t want to drop them! Keep a close eye on your rat until it recovers. Write down any information you might think help the vet diagnose the cause (what your rat was doing prior to the seizure, etc).
Take your rat to the vet for diagnoses. The occasional minor seizure might not cause serious problems, but more frequent ones can even be fatal.
For more information, please have a look at our other page on Seizures.