Dog barking represents the dog's emotion. When a dog howls, it may be: there are companions around who use howling to communicate, the dog is unhappy and expresses dissatisfaction with the people or things around it, or the dog is happy or excited. , dogs will also howl when chained and dominated. Therefore, it is normal for dogs to howl. If the dog howls non-stop and is accompanied by poor spirits, vomiting and diarrhea, the possibility of illness cannot be ruled out. It is recommended to send the dog to the doctor for examination.