Chihuahua

       Dogs can hear frequencies ranging from 15Hz to 50,000Hz. Researchers have found through tests that a dog's hearing is about 16 times more sensitive than that of humans, so compared to humans, dogs can better “listen to everything around.”

       Because dogs have such a wide hearing range, they can even hear ultrasound and infrasound. Sometimes you might notice your dog barking wildly for no apparent reason; it is very likely because they heard sounds that you cannot. Besides, dogs have a strong ability to distinguish sound sources. If they could speak, they would tell you the characteristics of every car sound passing through the neighborhood or whose footsteps are in the hallway.

       A dog's sensitive hearing also brings a lot of convenience to people. For example, they can help guard doors, and some dogs are trained as police dogs to assist officers in solving cases. However, precisely because dogs have developed hearing, they are easily frightened by high-frequency sounds. In daily life, you may find that dogs dislike the sound of vacuum cleaners; once they see their owner take out a vacuum, they will hide under tables or run to other rooms. Therefore, when you need to use a vacuum cleaner or other loud devices, it is best to place your dog in another room first.

       Here is a very classic little test that can help you understand how sensitive a dog's hearing is: prepare a metronome and set it to vibrate 96, 100, 133, and 144 times per minute. Dogs can tell the difference; can you?