Sometimes, the wound location or the amount of skin loss prevents surgical closure or bandaging. Puncture wounds or other trauma can force bacteria deep into the tissues, and a contaminated wound that is more than a few hours old should never be closed without surgical debridement. In some cases, closing the wound may result in more permanent damage than treating the wound medically and leaving it open to heal. However, if there is gross contamination or deep infection present, the wound will be left open for topical treatment and to ensure drainage. Your veterinarian may need to anesthetize your dog to remove foreign material and dead tissue from the wound. If the wound cannot be surgically closed, your veterinarian may apply a protective bandage, if possible. Do not apply ointments, creams, disinfectants, or any other chemicals to the wound, as they can interfere with healing. Wherever possible, a wound will be closed and sutured to speed healing.