Play it to your dog and see the reaction of him, you can trick him into believing like there is a dog suddenly apear out of nowhere. There are more than 40 type of sounds from many dogs like pitbull, chihuahua, german sheppherd, rottweiler, husky, pug, dobermann, great dane, pomeranian, basset, colie and more. Many kind of bark like angry, sleppy, fighting.