Dogs always bark at empty doors in the middle of the night. Why?

Dogs have very sensitive hearing, and even if they are kept indoors, they can hear the movement outside the door. In the dead of night, the dog will be awakened by some small sounds outside the door, and then start barking to remind its owner. In the eyes of the owner, there is no one outside the door, because this person has slipped away, and may be a thief who stepped on the spot. So the dog is protecting its owner, and the owner should give snacks to make the dog feel that it is right to do so.

Maybe a neighbor passed by or a thief stepped on it.

For dogs, there are many sounds in the world. Dogs can process all kinds of sounds and get useful information from them. For example, if a neighbor passes by the door, the dog can hear the sound and recognize it. For example, if a thief suddenly comes outside the door in the middle of the night, the dog can hear the thief's footsteps or lock the door. Because the host has fallen asleep and can't hear. Big dogs make you very excited. Even if you are asleep, you can be awakened by small movements, and then scream to scare the thief away. When the owner wakes up, the thief outside the door has escaped, so he will think that there is no one.

Maybe dogs have some wolf genes in them, so they howl at the moon in the middle of the night.

Dogs are tamed by wolves, so it is normal to have wolf genes in their bodies. Wolves howl regularly, such as at night, which can not only spread the news but also deter the surrounding animals from invading their territory. Although dogs have been kept in captivity for so long, some of their original habits cannot be changed. Husky dogs, in particular, have many wolf genes and always howl at bright places in the middle of the night. At this point, the owner does not need to worry, and can sleep with his head covered.

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If the owner suddenly hears the dog called out, he should go out and check the situation. Going out here means going out of your own door, not opening the outer door of the house. Because I don't know what's going on outside, it's best to observe through the cat's eye and don't open the door easily.