Canine pneumonia is a common and serious disease in clinical practice,mostly in puppies,mainly manifested as cough,runny nose,poor breathing,etc.,which can cause dyspnea and even respiratory failure in serious cases.The disease occurs more frequently in spring and summer seasons with changeable climate,and less frequently in autumn and winter,and puppies are easy to get.The main reason is that the respiratory tract of the puppy is not fully developed in terms of morphology and function,coupled with low immunity,if there is no timely vaccination,good warm measures,etc.,it is easy to suffer from respiratory diseases and pneumonia.This paper introduces a case of bacterial pneumonia in a puppy.Through clinical examination and laboratory testing,after the diagnosis,antibacterial and anti-inflammatory therapy,combined with atomization therapy,while improving the immunity of the affected dog to promote appetite,through 5 days of treatment,the ideal effect was achieved.