Although this behaviour has been observed and reported, it does not seem to be universal in all dogs according to certain studies. How dogs detect an oncoming seizure in humans remains a mystery. Some researchers think they detect subtle changes in human behavior or scent before an episode occurs. These dogs give the person an opportunity to take seizure blocking medication, to get to a safe place, or to call for assistance. In addition, a dog’s presence can be reassuring and relaxing and may cut down on seizure frequency and the ability for a dog to obtain help during or after a seizure could prove lifesaving.