A) Successful placement of the NPWT dressing is confirmed as it takes on a shrunken, hard and wrinkled appearance when the vacuum is applied. A foam dressing (KCI, San Antonio, TX) placed on an open elbow hygroma in a dog. B) Successful placement of the NPWT dressing is confirmed as it takes on a shrunken, hard and wrinkled appearance when the vacuum is applied. A gauze dressing (EZCare, Smith & Nephew, Largo, FL) placed on a dehisced stifle incision in a dog.