It could be a problem, Debi. Many topical vapor products contain essential oils such as camphor and eucalyptus, which have the potential to produce gastrointestinal upset and central nervous system depression. And if this product were aspirated or inhaled in large enough quantities, respiratory irritation and pneumonia could result.
Due to the high probability that your dog will ingest this product, and because it is not labeled for this intended use, we would not advise using this product on your Rottweiler. Instead, you should talk with your dog's regular veterinarian about an appropriate and safe method for keeping your dog from licking her wound.