* Powerful antibacterial * Antiviral * Antifungal * For wounds, ear scabies Colloidal silver helps fight ear and skin problems, which are common in dogs and cats. For oral application, we strongly recommend the use of propolis! For internal antiviral action, go for grapefruit seed extract. In addition, colloidal silver can help with tick and flea bites in dogs and cats. To protect your pet from parasites, we recommend our flagship pest control, 4-Thieves Vinegar. Colloidal silver was used internally before 2010 to destroy viruses, bacteria, microbes, and fungi of all kinds.