The reasons why dogs hum when sleeping:

1. Lack of security: Due to the lack of security, I hope to gain a sense of security through this method . This kind of humming sound is mostly produced by puppies, and adult dogs rarely use this method to gain a sense of security.

2. Feeling cold: Puppies have a weak constitution, insufficient immunity, and their own heat production system is not perfect enough. They will hum when they feel cold, so it is recommended to use warm blankets, etc. Provide your puppy with a warm enough environment to avoid catching colds.

3. Dreaming: It may be that the dog is dreaming while sleeping. Whether it is a dream or a nightmare, the dog may hum and bark. The dog uses this bark to express Emotions such as happiness and fear.

4. Disease: Physical discomfort may be caused by diseases, such as rhinitis, colds, viral diseases, etc. The owner can carefully observe Teddy's mental state, appetite and defecation. If there are any abnormalities, it is recommended that the owner take the dog to the pet hospital for examination and treatment in time.

5. Parasites: If the dog's mouth and limbs shake while sleeping, it may be caused by the migration of internal parasites. It is recommended that the owner regularly deworms the dog's body.

6. It may be snoring: it is common in short-nosed dogs, such as French bullies, English bullies, mynas, etc.

7. Unsound sleep: If dogs feel unsafe and unreliable when sleeping at night, they will grunt non-stop.

8. Eat too much: The dog eats too much. The food in the stomach has not been digested when sleeping. If it feels uncomfortable, it will make a humming sound. The owner can feed it some probiotics or Just wait for it to digest.

9. Uncomfortable sleeping: It may be that the dog’s kennel makes the dog uncomfortable. The owner can change the dog’s kennel to a more comfortable one.