If your dog is scratching, licking, or biting the same area repeatedly, the skin can become damaged, red, and sore. It’s a good idea to ask your dog’s veterinarian about the possible causes. It could be due to allergies, and in this event, your pet may require a prescription treatment such as Apoquel to treat the allergic itch. There also may be a skin infection that requires antibiotic or antifungal treatment from your veterinarian.