My dog’s vulva has been bleeding for days, with one vomiting episode and little appetite. What is wrong?

Bleeding from a female dog’s vulva is usually a sign of heat, during which discharge increases, the vulva swells, and a small amount of blood appears in the discharge, which the dog usually licks clean. Large breeds may bleed more, so to avoid messes the owner can put a dog diaper on her during her cycle. Heat lasts about 15 days, during which resistance, appetite, and mood are affected, so the owner should give more care, proper nutrition, and warmth. However, if the vulva discharges pus-like blood with ongoing poor appetite, fever, or other symptoms, it may be pyometra or endometritis and needs prompt veterinary care..