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Dog can hear from 40Hz to 60kHz so it will know if any natural disaster may occur some mins before itself .
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Dogs are the most turntable animals in this world most probably because we know that the dogs have faith on their owners. The dog can even hear the ultra sonic sounds and because of this quality they can hear a lot of sounds. By this quality they will be able to guard our house and even when there is any natural calamity we know that the dogs are the first one to know about it because they can know it by their special quality of sound. Here we can use the help of dogs to know about the natural calamity.
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