Hear Doggy Silent Squeaker Dog Toys toys give your pet the same sensation and enjoyment of traditional squeaky toys without the irritating noise! The science behind Hear Doggy: Dogs can hear sounds at a higher frequency (0 to 45KHz) than humans (0 to 20 KHz). Tuned to an ultrasonic range in the 24-28 KHz frequency, each Hear Doggy! squeaker is out of human hearing range, but still fun for your four-legged friend. These sturdy characters are made with Chew Guard Technology a manufacturing process that adds a tough, durable liner to every toy. The reinforced seams and specially engineered lining were made to withstand the rigors of a dog's play. Dogs are tough but Chew Guard is tougher! Ultrasonic, silent squeaker that only dogs can hear Soft plush toy with Chew Guard Technology has a tough durable liner to withstand tough play No messy stuffing in the body Reinforced seams for added durability The silent squeaker is perfect for the office and won't disturb your friends at work! Small - 6" Large - 10"