Brown liquid flowing from a dog’s lower body is menstruation

Brown liquid flowing from a dog’s lower body is menstruation. Dogs’ vaginas will secrete red or brown liquid during estrus. As the estrus progresses, it will change from red to yellow. brown. During this period, the dog will actively approach the male dog, stand still, and turn its tail to one side to accept the male dog's climb.

The brown fluid flowing from the dog’s lower body is open pyometra

Open pyometra in dogs means that the cervical canal is not completely closed, and a small amount of pus will flow out from the vulva from time to time. Sexual discharge, which is cream color, gray or reddish brown. The smell is unpleasant and often pollutes the vulva. The owner should take the dog to the hospital for treatment immediately.