My dog is one and a half and has started having seizers I do not know why can you help

Take him to the vet.
They will do bloodwork, and they may put him on some drugs to help curb them, like Potassium Bromide or Phenobarbitol.

Be sure to keep record of all the seizures. IE, what your dog was doing, how long they lasted, etc etc.

Could be a LOT of things that cause seizures.

Like Sariss said, a vet trip is the only way to know.
Please take him for your dogs safety.