HearDoggy! toys are fun and colorful, soft, and silly – but what really sets them apart is the ultrasonic squeaker that dogs can hear, but people can’t! Tuned to a frequency out of human hearing range, our special squeakers provide the same fun as a traditional squeaker, without the annoying noise that drives pet parents crazy. Well known for their remarkable hearing, dogs can perceive sounds at a much higher frequency than humans. Hear Doggy! squeakers are tuned an ultrasonic frequency between 24 and 28 kHz that is silent to people but provides dogs with the same excitement and fun as traditional squeakers.