How To Drain A Seroma Dog. If the fluid cannot be completely reabsorbed due to size or severity, a needle may can be used for extraction. When your dogs small blood vessels are ruptured, blood plasma starts to seep out and it becomes inflamed by the dying and injured cells.

Don't drain your own seroma. A seroma appears as swelling at the surgical site, and this can occur during the recuperation period that follows any surgical procedure. Keeping your dog active for a few days could actually benefit your health.