Seizure-alert dogs, as implied by their name, are dogs that can sense and notify their human companions of an incoming seizure. This alerting behavior has been reported to occur several seconds to 45 minutes or more before the onset of the seizure. The dog does this by exhibiting marked changes in behavior, including close eye contact, circling, pawing, barking etc. Once these dogs alert their owners of their incoming seizures, the owners can then make necessary preparations to avert or minimise the impact of the seizure. Source: epilepsy foundation.