Certainly, if the dog is near water - like a pool or a pond - you'll need to get him away from that area or he'll drown.
Once the seizure
is over, it can take quite some time for the dog
to return to normal. It really takes it out of them physically, so just keep him quiet and let him come back on his own.
Your vet will appreciate you documenting when each seizure occurs, what time of day, and how long each seizure lasts.