(Disease is described as:) a unique epilepsy phenotype of frequent myoclonic jerks/twitches, with an onset in young dogs...range 6 wk?18 mo)...Photosensitivity was reported... (in some dogs) The disease progressed to generalized tonic-clonic seizures (GTCS) in 38% of dogs within 6 mo (median; 1.5?29 mo) after onset of myoclonic seizures. Owners of three dogs (>8 y of age) reported that dogs retained normal cognition throughout life. Myoclonic jerks were described by the owners as severe startling or even resembling an electric shock. Preceding alterations in behavior were not observed. Myoclonic twitches mainly occurred when the animals were in a recumbent position and relaxed, drowsy, or in the first stages of sleep, and with the eyes either closed or open. Occasionally twitches occurred also when the dogs were sitting, standing, or walking... Intensity varied between events and individual dogs. Dogs were normal between events. Owners reported daily (87%) or almost daily (13%; every second to third day) occurrence of myoclonic twitches with a frequency of up to 150 twitches per day. (Wielaender et al, 2017)