1) pulmonary edema-a build up of excess fluid in the interstital space between the alveoli and the capillary 2) pulmonary fibrosis-a build up of fibrous tissue in the interstital space 3) pneumonia-a build up of inflammatory fluid and cells in and around the alveoli.
The first day of bleeding is called the first day of heat. The duration of proestrus can vary from as little as 1 day to 21 days. Proestrus is a time of rising estrogen levels preparing the reproductive tract for breeding. Estrus: Is the period of receptivity. Behaviorally it begins the first day the bitch stands.
Otherwise, general intermittent bleeding around the vulva may continue for weeks or, in some cases, months. If you notice that your dog is actually still bleeding a few days after birth, contact your vet. While it may be normal, you need to rule out complications like postpartum hemorrhage, which can result from poor blood clotting.