As the skin stratum corneum is weak, scratched by the dog can cause the epidermis or capillary rupture causing skin redness, the body’s normal cells have clotting and repair functions, and will soon recover. Because the dog paw often contact the ground, mounds of soil and other microbial environment, although there is no obvious breakage, bleeding, but also recommended that patients rinse the skin surface with water, soap and water, and local application of iodine volts, play a role in cleaning, disinfection. If the local skin breaks down and bleeds, the wound needs to be cleaned immediately, the contaminated blood squeezed out and rinsed off, and then go to the hospital for sterile treatment. Whether it is a domestic pet or a stray dog, or a dog that has been vaccinated, rabies virus may be present and can cause rabies by invading the body through wounds that come in contact with humans. Minor bites or scratches do not necessarily cause disease, but patients should not take any chances and should be treated promptly at a hospital where a doctor will determine the extent of the disease and decide whether vaccination is necessary. It is recommended that patients with pet cats or dogs at home should bring their pets for vaccination in a timely manner and bathe them regularly to clean their hair and reduce bacterial growth so as to avoid infections caused by accidental scratches or bites to the human body. In addition, the redness scratched by the dog can be relieved by itself, but it may also be due to the patient’s sensitive skin, and animals are common allergens that can cause patients to develop an allergic rash and redness, but it can generally subside after moving away from the allergen. Patients are advised to go to a hospital dermatology department for allergen screening and to avoid contact in their lives to reduce or eliminate skin symptoms.