Reasons for dogs howling in the middle of the night:

1. When a dog is in estrus and wants to go out to find the opposite sex to mate, he will howl in the middle of the night. You can wait until the estrus period is over. Take him to be neutered.
2. Dogs are very vigilant. When they hear movement outside the door, they will start howling in an attempt to drive away the people outside.
3. Dogs with high energy will not sleep in the middle of the night and keep barking. The owner can play with it more during the day to consume its energy and rest quietly at night.
4. The dog will keep howling when it is hungry or thirsty. The owner can prepare food and water for it before going to bed.
5. The dog will keep howling when it feels cold. The owner should take measures to keep it warm in time.
6. The dog will keep howling when it feels uncomfortable or in pain. The owner should take it to the pet hospital for treatment as soon as the owner finds out.