In the late stages of canine distemper, dogs will have symptoms such as foaming at the mouth, pus on the skin, and ulcerated wounds, which means that the dog's life is irretrievable and may die at any time. You should pay attention to the dog's physical condition. Once an abnormality is discovered, it should be sent to the pet hospital for examination and treatment immediately to avoid aggravation of the condition. The dog should be dewormed and prevented regularly, and the dog's living environment should be cleaned and disinfected frequently to reduce the growth of bacteria.