Drains (soft rubber tubes) are typically placed in wounds to prevent the accumulation of fluid under a suture line that can cause infection, contribute to wound dehiscence (come apart), or delay healing. Drains provide a pathway for trapped fluid to escape from a wound. They are placed at various time during surgery, usually before closure of the wound. There are a multitude of types and styles of drains. Some are passive and simply allow a portal for fluid to escape. Some provide active suction.

Your vet will decide whether a drain is needed in a wound, and choose the type of drain. Generally, a drain is preferred, as extra drainage is often better than not enough. A properly placed drain allows drainage to occur, and minimizes swelling of and drainage from the suture line.