An electromechanical horn having a generally L-shaped housing containing a sound generating system including a piezoelectric speaker generates a series of short, audible sound signals in a repetitive pattern, the generated sound signals having fundamental frequencies with associated harmonic component frequencies and decibel levels that fall within a frequency range of from about 3 kHz to about 10 kHz, and decibel levels in a range of from about 75 dB to about 115 dB to disperse or deter an aggressive animal in a non-detrimental manner. The lower portion of the horn is configured to be held in the palm of a hand of a user. A strap mounted on the back side of the housing forms a loop that can be grasped by the palm of the users hand, or extended over the back of the hand, and a depressible thumb button disposed at the back end of the upper portion receives the users thumb.
