“Hear Doggy” Ultrasonic Chew Toys
Dogs love noisy chew toys, but humans? Not so much. Save yourself a lot of annoyance and get your good boy or girl a "Hear Doggy" ultrasonic squeaker. These toys are tuned to the 24–28 kHz range, which is beyond the frequency of human hearing but well within what a dog's ears can pick up, so they can still squeak to their heart's content while you enjoy that sweet, sweet silence. Great for offices, hotels, family gatherings...you name it.
They've got a number of animal styles to choose from: