The respiratory tract of breeding horses and sport horses provide the necessary oxygen for the combustion of nutrients. However, problems such as snot, mucus, inflammation of the mucous membrane and pneumonia disrupt optimal breathing. Various factors, including housing, nutrition, general resistance, infection pressure, diseases, hygiene and stable climate, contribute to the development of respiratory diseases. A healthy respiratory condition is crucial for good feed intake, utilization and ultimately the performance of breeding horses and sport horses. Reducing respiratory diseases contributes to minimizing economic damage.