Horses can hear frequencies up to 35 kHz. Horses do not engage in ultrasonic communication, but it appears that they have evolved high-frequency hearing primarily in response to the need to localize the sound. An anti-bark collar used by some horse owners does not seem to affect horses. However, you might test the controller around horses in a controlled environment.
FAQ #36613
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Can high-pitched ultrasonic frequency be heard by or affect my horse?
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