There may be many reasons for dogs to bleed down there. Here are some possible situations: Estrus: This is the most common cause. During the period when a dog is in estrus, blood will leak out from the uterus to the vagina, which usually lasts for 7 to 14 days. Oh my god, I have estrus twice a year. This is a normal physiological phenomenon. If there are no abnormalities in the dog's eating, drinking and mental state, there is no need to worry. Vaginitis: If the dog's daily living environment is very harsh, bacteria may enter the vagina, causing the dog to get vaginitis.

Vaginal injury: If the dog is mating, the male dog's penis is too large and may damage the female dog's vagina. , causing bleeding.

Pyometra: This is a disease of the reproductive system. Dogs may have vulvar discharge that turns brown or is purulent. If pyometra is suspected, it is recommended to take the dog to the hospital for B-ultrasound diagnosis, and surgery may be required to remove the uterus.