Juvenile myoclonic epilepsy (Rhodesian ridgeback type) is a neurological disease affecting dogs. Dogs affected with this type of epilepsy present between 6 weeks and 1 ½ years of age with frequent, uncontrolled muscle movements known as “myoclonic jerks” which may resemble electric shocks or a startle response. Myoclonic jerks most commonly occur in the limbs, head, eyelids, and jaw and range from mild, nearly imperceptible movements to severe, dramatic movements resulting in jumping or running short distances, sometimes into objects. Myoclonic jerks are most common when dogs are relaxed or in the beginning stages of sleep. Some dogs with this type of epilepsy may experience increased incidence of jerks after vaccination or when exposed to high ambient temperatures or various visual stimuli, including light flashes or sudden change in light intensity. Affected dogs appear normal between episodes, but may appear disoriented or agitated immediately afterward. The disease may progress to generalized seizures in some dogs.