Any pet lover knows that dogs love the feel and sound of "squeaky" toys, but enduring the high-pitched repetition in the wee hours of the night can drive any pet-parent crazy! Ultrasonic HEAR DOGGY!® toys are made with a squeaker ONLY your dog can hear! Hear Doggy! plush 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 45 KHz) 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. We know you love your pet, but sometimes you just wish you couldn"t hear those squeaky toys! Now Quaker Pet Group brings you a line of toys that only they can hear. The Hear Doggy!TM Plush toys are just that, silent. The patented squeaker is tuned to an ultrasonic frequency that only your canine companion can hear, making playtime enjoyable for both your pet AND YOU. The plush is made from new, extra tough materials. Whale Large - 9" x 4" Penguin Large - 10" x 8" blowfish Large - 8.5" x 8". Due to sanitary and hygiene reasons dog toys are non returnable. Thank you for understanding