My dog has an open wound in the face, near her eyes, almost including her eyes in the wound. It is oblong with about 1 inch wide. The flesh could already be seen. The wound had been there for months and there are no signs of drying up. Sometimes pus could be seen on the wound and the dog licks it, maybe to clean it. A vet is not accessible. No remedies had been initiated. Please suggest on how to heal the wound. THanks.