Abstract: An ultrasonic toy for animals is comprised of a noisemaker arranged to produce ultrasonic noise at about 30 to 70 dB, which is loud enough to be clearly heard by an animal but not enough to be aversive, frightening or harmful to the animal. The noisemaker is comprised of a resonance tube attached to an air bladder. The resonance tube includes a closed outer end, an axial hole open to the inner end, and a notch on a side wall communicating with the hole. An insert is positioned inside the hole. Keys in the hole and the insert align the insert radially and longitudinally within the hole. An alternative noisemaker is comprised of an electronic transducer driven by an oscillator which is activated by a pressure sensitive switch. An alternative air bladder includes a recess wherein the resonance tube is positioned to protect it from being dislodged or blocked.