It can be replaced according to the size of the dog. Small and medium-sized dogs should be replaced every 8-10 hours, and large-sized dogs should be replaced every 6-8 hours. The specific replacement time should be selected according to the specific situation of the dog. During the period of the dog's aunt, the breeder can prevent the dog from licking and rubbing randomly. The breeder can put on menstrual pants and diapers for the dog; during the subsequent estrus, also Copulation can be prevented by wearing menstrual pants.