Dogs howl to notify other dogs of there presence. Howling can be heard at much longer distances than barking, so howling is your dog's long distance form of communication. Howling is non-aggressive. When your dog hears another dog howling he thinks it is likely far away so there is no need to be aggressive. This skill presents a random assortment of howls and siren sounds that are sure to trigger your dog’s primal howling response. If it doesn’t cause your dog to howl the first time, try again and a new set of howls will be presented.