Hernia refers to the condition where visceral organs protrude through weak points or fissures in the diaphragm into the thoracic cavity or other anatomical cavities. Diaphragmatic hernia in cats is a pathological state where one or more visceral organs from the abdominal cavity enter the thoracic cavity through a ruptured diaphragmatic opening. It is predominantly caused by accidental trauma to the diaphragm or congenital diaphragmatic developmental anomalies. Timely treatment of diaphragmatic hernia in cats is crucial to prevent respiratory distress and potential life-threatening consequences. This article presents a case study of a severely affected cat with diaphragmatic hernia, its diagnosis through clinical and laboratory examinations, successful surgical treatment, and postoperative care, providing valuable insights for the management of similar feline diaphragmatic hernia cases.