known cause for primary or idiopathic epilepsy, which is only diagnosed by eliminating other possible causes for the seizures. Dogs with idiopathic epilepsy experience their first seizure between the ages of one and three. However, the age at diagnosis is only one factor in diagnosing canine epilepsy, as one study found cause for seizures in one-third of dogs between the ages of one and three, indicating secondary or reactive rather than primary epilepsy. A veterinarian's initial work-up for a dog presenting with a history of seizures may include a physical and neurological exam, a complete blood count, serum chemistry profile, urinalysis, bile tests, and thyroid function tests. These tests verify seizures and may determine cause for reactive or secondary epilepsy. Veterinarians may also request that dog owners keep a "seizure log" documenting the timing, length, severity, and recovery of each seizure, as well as dietary or environmental changes. Treatment Many antiepileptic drugs are used for the management of canine epilepsy. Oral phenobarbital, in particular, levetiracetam and imepitoin are considered to be the most effective antiepileptic drugs and usually used as ‘first line’ treatment. Other anti-epileptics such as zonisamide, primidone, gabapentin, pregabalin, sodium valproate, felbamate and topiramate may also be effective and used in various combinations. A crucial part of the treatment of pets with epilepsy is owner education to ensure compliance and successful management. Cats Seizures in cats have various initiating factors. Cats can have reactive, primary (idiopathic) or secondary seizures. Idiopathic seizures are not as common in cats as in dogs however a recent study conducted showed that of 91 feline seizures, 25% were suspected to have had idiopathic epilepsy. In the same group of 91 cats, 50% were secondary seizures and 20% reactive. Classifications Idiopathic epilepsy does not have a classification due to the fact there are no known causes of these seizures, however both reactive and symptomatic secondary epilepsy can be placed into classifications. Cancer Meningiomas, lymphomas and glial cell brain tumours are the most common cancers in cats and are all common causes of seizures. Vascular disease Vascular disease refers to any condition that effects the flow of blood to the brain and can potentially result in seizure disorders. Common vascular diseases in cats include, feline ischemic encephalopathy, polycythemia and hypertension. Inflammatory/infectious Any inflammatory or infectious disease that reaches the brain can result in inducing seizures. The most common inflammatory or infectious diseases which cause seizures