answer:When you say “twitch and shake really bad”, how bad is it, exactly? Both dogs and cats can have dreams where there legs twitch and kick quite a bit, but it doesn’t look like they’re out of control and flailing everywhere. I’m not a vet and I don’t know for sure, but I would think that if your kitty was having seizures it would also happen when he’s awake. However, there’s always a possibility that he’s having more than an active dream and that it is seizures. To be on the safe side, I absolutely suggest taking him to see a vet. If you want, call a local pet hospital first and briefly explain what’s going on. If you can’t talk to a vet right then, they’ll have one call you back and they’ll tell you whether or not they think you should bring him in.