Yes, but it is rare. A more likely reason for seizures in a German Shepherd would be an allergic reaction to chemicals or foods. Rule out all allergies before further testing for epilepsy. You'll also want to make sure the dog has never suffered any head trauma, which could cause occasional seizures.
Yes German Sheperds can have epilepsy. All breeds of dogs can have epilepsy. With epilepsy, the dog suffers from seizures. This can be controlled through medication.
Yes, this is a fairly common problem. There are a wide variety of seizure issues with this breed, so it's best to ask your veterinarian about your specific dog.
Yes, epilepsy in German Shepards is possible. Here are some reasons that can cause epilepsy: brain tumors, Liver Disease, low blood sugar, severe worm infestation, and infections.