Seizures in dogs create a disturbing effect on the owner. Its up to us to understand that its a health problem and requires attention. Being disturbed will not solve the case. Things you need to do while your dog goes into a seizure is key. First of all you need to note down the time it goes into seizures. If its lesser than 3 minutes its usually ok but if it repeats every few hours then you need to note down and get veterinary help. While you are at the vet you may need to tell the the number of times it went into seizure and for how long.
Also make sure that you provide with support through out the time it goes in to seizure. Avoid children and also make sure that the environment is calm while your dog goes into such state. A calm environment reduces anxiety and sometimes help relieve the tension a bit faster.
The first aid is temporary. Consult a Vet As soon as you can.