Seizures in dogs can be caused by a variety of things, from metabolic disorders to brain tumors. Some common causes of seizures in dogs include: low blood sugar, trauma, ingestion of toxins, infections, heat stroke, brain tumors, genetic disorders, and anemia. In some cases, the cause of a dog's seizures are never found. If your dog has repeated seizures, it is important to consult with a veterinarian to determine the underlying cause and develop an appropriate treatment plan.