Menstruation in dogs usually lasts for 10 to 15 days. Each dog has a different constitution, the duration of menstruation is different, and the amount of menstruation may also be different. Dogs usually menstruate twice a year, with an interval of half a year.
The amount of menstrual blood in small dogs is generally not a lot. After the menstrual blood flows out, the dog will lick it clean by itself, so It may not be easy for the owner to find out, but large dogs have more menstrual blood. If the dog has more menstrual blood, the owner can put it in menstrual pants to avoid dirtying the environment.