Why Do Dogs Always Bark at the Air? 为什么狗总对着空气汪汪叫？

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A dog can be a person’s best friend， or so the theory goes. But that relationship can be tested when a dog begins barking at an empty corner of a room， at a door， or anywhere where there doesn’t appear to be any activity at all taking place.

Is the dog hallucinating？ Or does it simply want to drive its owner to the brink of sanity？

According to the American Kennel Club （AKC）， the most common explanation for unprompted barking is that it’s not really unprompted at all. Instead， it’s likely that humans are simply unable to perceive whatever visual， aural， or olfactory cues the dog is sensing.

Dogs are， obviously， equipped with superior hearing， including the ability to detect sounds that are higher in pitch. In theory， a dog could be reacting to a noise that a person nearby wouldn’t be able to hear—possibly a far-off vehicle siren.

If a dog barks seemingly unprompted at night， it might be because ambient noise is lessened and they’re more attuned to the barking of other dogs. Because dogs are territorial， one dog barking can turn into many.

常理上来讲，狗是人类最好的朋友。（剩余2012字）