Dogs may be infected with canine distemper because they are exposed to dogs and virus-containing secretions without vaccination or have low resistance, or they themselves carry canine distemper. Virus can cause canine distemper infection. Generally, the immunity of puppies will gradually decline when they are two months old. At this time, they need to be vaccinated, strengthened nutritional supplements, and improve their resistance. Dogs that have not been vaccinated should not be taken out or bathed.
