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An open abdomen allows passive drainage of the abdominal effusion in a sterile bandage applied over the midline incision of the laparotomy (Staatz et al. 2002; D'Hondt et al. 2007; Madback and Dangleben 2015). This technique allows daily lavage of the peritoneal space while the bandage is changed (Staatz et al. 2002; D'Hondt et al. 2007). It can also be associated to a vacuum‐assisted bandage to actively drain the peritoneal space (Buote and Havig 2012; Madback and Dangleben 2015).

At the end of a laparotomy a 2‐0 monofilament nonabsorbable suture is placed loosely across the linea alba (Figure 5.4a). The linea alba should be maintained open on the entire length of the incision. Several loops of sutures are placed 3–5 cm from the edges of the skin incision and 3–4 cm from each other. Loop areas are placed at the cranial and caudal ends of the incision (Figure 5.4a see arrow).

The laparotomy incision is then covered with two to three layers of sterile laparotomy sponges. Umbilical tape is then laced through the loop of suture over the laparotomy sponges. A sterile sticky plastic drape is then placed over the bandage and the skin to isolate the bandage from the environment (Figure 5.4b and c). If the patient is a male dog, a urinary catheter should be placed to prevent contamination of the bandage with urine.

Bandage is changed on a daily basis in the operating room. At each bandage change the abdominal cavity is flushed with sterile saline. A cytology is performed daily, and when cytology is improved, with a reduction of the number of bacteria and degenerative neutrophils, the abdominal cavity is closed over a closed suction drain.