Whether dog pneumonia can be transmitted to other puppies depends on what type of pneumonia it is. If the pneumonia is caused by viruses and bacteria, it is contagious to a certain extent. There are three reasons why dogs get pneumonia: 1. Respiratory tract or external microbial infection 2. Inhalation of harmful gases 3. Pneumonia caused by colds, canine distemper or parasites. If your dog gets pneumonia, it is recommended to go to the hospital for examination and treatment in time to confirm whether there is infection. Sexually, it is best to treat in isolation to avoid infecting other dogs.