When a dog comes to aunt, the dog will be irritable and restless, have bloody discharge from the vagina, have red and swollen vulva, and make a scream-like sound in the middle of the night. During the period when the dog is in estrus, the owner needs to clean the vulva regularly and keep it clean and tidy. If possible, the owner can wear special sanitary pants for the dog.

If the owner does not want the dog to breed offspring, he can also take the dog to the hospital for sterilization after the dog is in heat. The female dog's estrus period is about fourteen days, and she will go into estrus once every six months. The first time she starts estrus is usually between four months and more than one year old. However, dogs and humans have different physiques. Some dogs’ menstrual period lasts for several days, and dogs’ menstrual blood is drop by drop.