Cube Chihuahua Whistle from Maywa Denki (Blue) Blow into the chihuahua's tail to create sound If you blow normally, the whistle makes a "wooo" sound Once you've got the chihuahua singing you sweet melodies, open its mouth!!! It will then start to "Bow Wow" at you. Or as the Japanese dogs say, "Wan Wan." Produced by Cube These chihuahuas are also compatible with Otamatones. Take the tail off your Otamatone and put it on your Chihuahua Whistle!